Tumbling (or DamageFall internally in Melee and Brawl files) is an airborne state that a character may enter after being hit or pushed in certain ways; for example, edge slipping can cause a character to tumble. A tumbling character can easily be identified by their defensive, rotating animation. Characters may tumble after being hit through the air by an attack with strong enough knockback, footstooled in midair, pushed off a ledge, after walking off an edge while carrying a crate or other heavy item, or by sliding off of an edge while shielding.
In all Super Smash Bros. games, the minimum knockback that must be inflicted to cause tumbling is roughly 80 units.
Actions possible while tumbling
If tumbling characters hit the ground without teching, they will land into a lying position and must then use a floor recovery. Characters undergo a flopping animation upon hitting the ground before they can use their floor recovery, leaving them vulnerable for a short while.
The tumbling animation is used after a shield jump, though no action can be performed during this time. It is also used at the end of Olimar's Final Smash (after emerging from the Hocotate Ship), but Olimar will be unable to do anything other than move horizontally.
Notably, a tumbling character can not fast fall.
Reeling (or DamageFlyRoll) is a state similar to hitstun, except the characters enter a helix motion. In all games, this only occurs once the character is at 100% or more, and occurs 30% of the time. During this state, characters cannot do anything except DI, or tech if they come into contact with a wall or ceiling. Once the knockback diminishes and the character slows down, reeling ends and tumbling begins. Teching is useful for characters with high damage, or during Sudden Death matches, since being attacked under such circumstances often causes reeling. Reeling can also occur after using the Bullet Bill; however, it does not end naturally, and can be canceled by using an aerial attack or air dodge, or landing.
Because of the character's two-dimensional nature, Mr. Game & Watch has a unique reeling animation. Instead of spinning, he repeatedly cartwheels as he is launched.
In Smash 4, the reeling animation does not allow characters to tech on the floor until the hitstun cancel window starts. However, it does allow Cloud to tech walls and ceilings if he is hit near the apex of Climhazzard, where teching is otherwise impossible.