Crumple

Crumpling, officially known as falling in place, is a status condition that debuted in Super Smash Bros. 4 and reappeared in Super Smash Bros. Ultimate. The only characters that utilise it are Ryu, Ken, Ridley, and Kazuya.

Overview
Any fighter afflicted with the crumpling effect will be stunned momentarily. In the air, the fighter is essentially paralyzed, but if grounded, they collapse to the floor in a weakened state. During this time, they are unable to move or act until the animation passes. After the animation has ended, the fighter is in the state of a missed tech, and can do a Floor attack, neutral getup, or roll to either side. After waiting enough time, the fighter is automatically returned to their standing position. Any opponent hit by a crumpling attack while in the crumple animation will be launched, such as if hit by the move while in the air.

The effect for each crumpling move is not affected by damage of the target or rage of the attacker, or staling of the crumpling move. The crumpling effect cannot be decreased by button mashing. These factors guarantee the attacker a set amount of time for a follow-up attack, though the victim's animation may shift their hurtboxes in a way that makes them harder to reach.

Each crumpling move has their own unique crumple effect, each with different durations.

While some fighters initially had different lengths of vulnerability while crumpling, this was changed in version 11.0.0 of Ultimate so all characters have the same vulnerability window.

Trivia

 * The animation for a grounded crumple is the same as when a character is defeated by a weak attack in Stamina Mode.