Sacks, Scrambles and the Quarterback Slide

By 4Football Staff · October 8, 2026 · 10 min read

How a sack is defined and counted, how a scramble differs from a designed run, and why a quarterback who slides feet-first is protected from a hit. The rules in plain language.

A quarterback drops back, finds nothing open and takes off. He picks up eight yards, sees a linebacker closing from the side and drops into a feet-first slide. The linebacker pulls up. A different quarterback on a different Sunday is dragged down five yards behind the line of scrimmage while still holding the ball, and the stat sheet credits a sack to the defender who got there first.

Those three words in the title, sack, scramble and slide, describe three connected situations that confuse newer fans because the scoreboard treats them differently. A sack is a defensive statistic and a loss of yardage. A scramble is a run that began as a pass. A slide is a way for a runner to give himself up and be protected from contact. This guide explains how each one is defined, how the stat keepers count them and what the rules say about protecting the quarterback.

What a sack is

A sack is a tackle of the quarterback behind the line of scrimmage on a play that began as a passing play. The defender, or defenders, who bring him down are credited with the sack, and the offense loses the yardage between the line of scrimmage and the spot of the tackle. It uses a down.

The definition has a few parts that matter.

• Behind the line of scrimmage. A tackle of a passer beyond the line is a tackle of a runner, and the play is a rush, not a sack.
• A pass play. If the quarterback is tackled behind the line on a designed run, the result is a loss on a rushing play and not a sack.
• A tackle, or the equivalent. A quarterback who is forced out of bounds behind the line or who goes down in the end zone has also been sacked in the usual sense. A defender who knocks the ball loose forces a fumble and may be credited with both a sack and a forced fumble.

Sacks can be shared. When two defenders combine on a tackle, scoring rules allow each of them to be credited with half a sack. That is why you will see decimals in a sack total, such as 8.5.

The history of the word

The word itself is part of football lore. Defensive lineman Deacon Jones is widely credited with coining it, comparing the tackle of a quarterback to sacking a city. The NFL did not count sacks as an official statistic for many years. It began recording them officially in 1982, so totals for earlier seasons are research projects done after the fact by historians and may differ from source to source.

Who is responsible for a sack?

Fans often blame the quarterback for a sack, and a sack is one of the most misunderstood numbers in the box score. A sack is the result of several things happening together.

• Pass protection. The offensive line and the backs and tight ends who help block must hold off the rushers.
• Pass rush. The defense must beat that protection, sometimes with a blitz that sends extra rushers.
• Time to throw. A quarterback who holds the ball longer is easier to sack. A quarterback who gets rid of it quickly is harder to sack, regardless of the line.
• Coverage. If receivers are covered and nobody is open, the quarterback waits for someone to come free, and the rush has time to arrive.
• The play call. A deep-drop play takes longer than a quick pass.

Analysts therefore look at sacks along with other numbers: how often the quarterback was pressured, how quickly he threw and how many sacks happened per attempt. A common way to compare quarterbacks is sack rate, which divides sacks by the number of times the quarterback dropped back to pass, rather than by games played. Different data providers define dropback slightly differently, so it is best to compare numbers from one source.

You can see sacks and other passing numbers on our leaders page and on the player pages for individual quarterbacks.

What a scramble is

A scramble happens when a quarterback drops back to pass, finds the pocket collapsing or the receivers covered and runs. The play started as a pass but turns into a run.

How it is scored depends on what happens.

• If the quarterback crosses the line of scrimmage and is tackled, it is a rushing attempt with a gain or loss, just as it would be if he ran on a designed play.
• If the quarterback is tackled behind the line of scrimmage while still looking to throw, scorers generally call it a sack.
• If the quarterback scrambles and then throws a forward pass from behind the line, it is a pass attempt, complete or incomplete.

The key word is judgment. Statisticians in the press box decide whether a quarterback tackled behind the line was still trying to pass or had turned into a runner, and the call can differ from one scorer to the next. For that reason, you may see slightly different sack and rushing totals for the same game on different websites.

Two rules help shape a scramble.

1. A quarterback who leaves the pocket becomes more like a runner. He can be tackled by any defender, subject to the rules against late hits and targeting. The special protections for passers in the pocket, discussed below, still apply while he is in the act of throwing or just after he throws.
2. A quarterback who runs past the line of scrimmage can no longer throw a forward pass. Once the passer has crossed the line, a forward pass is illegal. He can still throw a backward pass.

The slide

A runner who does not want to take a hit can give himself up. The most common way is a feet-first slide, in which the runner goes to the ground feet first, with his head and upper body away from the defender. A quarterback who slides is not required to be tackled, and defenders are not allowed to hit him.

At the professional and college levels, the broad rule is this:

• A runner who begins a feet-first slide is treated as giving himself up, and the play is over.
• Defenders must not make contact with a sliding runner. A defender who hits a player who has clearly started to slide is penalized for unnecessary roughness, which in the NFL and college is a 15-yard foul.
• The protection applies to any runner who slides properly, not only quarterbacks, although quarterbacks use it most often.

The slide has to be a real slide. A runner who dives headfirst is not protected, because he can still lower his head into a defender, and a runner who slides late, with a defender already about to make contact, may not get the protection. Officials judge whether the runner clearly began the slide in time for the defender to avoid the contact.

High school rules have their own version of the slide rule, and the details of the signals, the penalty and the point at which the ball is dead can vary by state association. In general, a ball carrier who slides feet first is treated as down, but the wording differs. Confirm your own state's rule.

Why quarterbacks slide

A quarterback is a valuable player and a vulnerable one, and the slide gives him a way to keep a gain without absorbing a collision. A quarterback who picks up the first down and slides ends the play on his terms. The same quarterback who lowers his shoulder into a safety risks injury and a fumble. Coaches often tell their quarterbacks to get down when the safety is about to arrive.

The slide also has a cost, and it is a subtle one: giving up the last few yards. A runner who slides starts the slide before the defender arrives, and so he may lose a yard or two of progress. A quarterback near the goal line or the line to gain makes a judgment about whether those yards are worth the risk.

The protected passer

Quarterbacks have other protections beyond the slide, and they apply to the moment of the throw.

• Roughing the passer. A defender may not hit a passer late, after the ball is gone, or hit him below the knees or in the head and neck area, or land on him with his full body weight. We cover the details in roughing the passer explained.
• The "in the grasp" rule. In the NFL and in college football, a passer who is in the grasp and control of a defender, so that his forward progress is stopped, can be ruled down by an official. The referee blows the play dead, and the quarterback is considered sacked. The idea is that a passer being held up by a defender should not be thrown to the ground. The wording and the way it is applied differ by level, so check your own rulebook.
• Defenseless-player rules. A passer who is in the act of throwing, or has just thrown, is considered defenseless, and the defender must avoid certain kinds of contact.

In all of these cases the officials are balancing two goals: keeping the pass rush effective and protecting a player who is in a vulnerable position. The result is a set of rules that look fussy until you remember that a quarterback has both hands busy with the ball and no way to brace.

How the levels count a sack

The three levels share the basic concept of a sack but differ in the details of how it is counted.

The most surprising item for many fans is the second row. For many years, college football counted yardage lost on sacks as negative rushing yards for the quarterback, which could make a quarterback's rushing total look poor even when he ran well. The NCAA has made changes to the way these yards are credited, so use the current statistics manual when you want to compare a college quarterback with a professional.

Common mistakes and misconceptions

Some ideas about sacks and slides circulate widely and are wrong.

• "The sack is the quarterback's fault." It can be, but often it is not. A coverage sack, where the quarterback waits for a receiver who never gets open, is different from a protection breakdown.
• "A quarterback tackled for a loss is always sacked." Only if the play was a pass. A designed run for a loss is a rush.
• "A slide always keeps the first down." A slide ends the play where the officials rule the runner gave himself up, so a quarterback who slides short of the line to gain is short of it. He has to judge the distance before he goes down.
• "A defender is allowed to hit a sliding quarterback if he is already moving." A late hit on a sliding runner is a foul, though officials do give defenders a reasonable time to react.
• "A scramble is a pass." A scramble that ends past the line is a run, and the quarterback's rushing stats go up.
• "A sack must end the play." A quarterback can be hit, break away and throw, and no sack is recorded.

Practical tips for players and fans

If you are a quarterback in youth or high school football, these habits protect you and help your team.

1. Learn to slide early. A feet-first slide works best when you begin it before the defender is within arm's reach.
2. Protect the ball. Many quarterbacks fumble when they are sacked because they hold the ball loosely with one hand. Two hands on the ball in the pocket reduce the risk.
3. Throw it away legally. If you are outside the pocket, a throw toward the sideline that reaches the line may save a down. See intentional grounding explained for the limits.
4. Know the end zone rules. A sack in your own end zone is a safety, two points for the defense.

If you are a fan, the next time a quarterback takes off, watch the safeties. They have to choose between closing in for a tackle and giving the quarterback room to slide. The best defensive players know which is which. Our scores page lists final results and play totals so that you can see how the sack totals relate to the final score, and our Play section has information for people who want to try the game themselves.

The short version

• A sack is a tackle of the quarterback behind the line of scrimmage on a passing play, and the offense loses the yardage and the down.
• Sacks can be shared as half sacks, and the NFL began counting them officially in 1982.
• A scramble is a run that started as a pass; it is a rush if the quarterback crosses the line and a sack if he is tackled behind it while still looking to pass.
• A runner who starts a feet-first slide is treated as giving himself up, and a defender who hits him draws a flag.
• Quarterbacks are also protected by roughing rules and by in-the-grasp rules that vary by level.
• Statistical treatment of sack yardage differs between the NFL and college, so check the current stat rules before comparing.