Flying Slam is essentially the same move as Koopa Klaw from Melee on startup: clawing at the opponent. However, the similarities end there: it lacks a hitbox outside of the grab range, and once it connects the command grab automatically transitions to a flying suplex. Thus, there is no pummel unlike the Koopa Klaw either, and its Forward and Back throws are also removed. Fundamentally, Koopa Klaw and Flying Slam are completely different command grabs.
During the suplex, Bowser's air movement can be controlled greatly. However, as Bowser and his opponent's percentage difference increases, each player can control the movement. The higher Bowser's percentage, the less control he has.
Victims aren't entirely at Bowser's mercy, though, as they can also alter Bowser's horizontal trajectory - whoever has less damage will have more control over Bowser's movement. On occasion, if the Bowser player and another player are falling off stage it may connect, and can be used as a recovery move. Additionally, when he is in the higher control port, Bowser's death after the Bowsercide can be stalled by mashing the jump button while holding the control stick in one side-direction. This will cause him to perform a second jump, not unlike the motion of a shorthop. This can be extended further by using Fortress, and can be used to survive a Bowsercide on stages like Castle Siege (when the stage is about to change) and Norfair (when the lava is at its lowest point).
In Brawl and Super Smash Bros. for Nintendo 3DS versions older than 1.0.4, this move can be used to easily cause a sacrificial KO (commonly known as "Bowsercide"), which is particularly useful against edgeguarders performing a "wall of pain"-style edgeguard. Interestingly, the DOJO!! has stated that if one uses this move to do a sacrificial KO while both are on their last stock, the game would be called in Bowser's favor. However, this only happens when Bowser's controller port is lower (such as Bowser is player 1 and the opponent is player 2), but if Bowser's port is higher, Sudden Death occurs. A common tournament rule gives the victory to Bowser in this situation, regardless of what the game's result screen says, as Bowser is above the player during the move. Others however go by what the results screen states, to avoid conflicts. In 3DS version 1.0.4 and beyond and Super Smash Bros. for Wii U, Bowser would instead get KO'd first, making him lose if he and his opponent are on their last stocks. Additionally, the opponent would also get released after Bowser gets KO'd, giving them the possibility to recover back to the stage. This change remains in Ultimate.
Since foes in the Subspace Emissary cannot be grabbed by special moves, Bowser does not actually perform a flying slam. Interestingly, he merely inflicts damage with his claws, just like the Koopa Klaw did in Melee.
In Super Smash Bros. 4 and Ultimate, Flying Slam can also deal collateral damage to fighters who are caught in the crossfire of the slam. However, this only applies to Bowser's Flying Slam, as Giga Bowser's variation of Flying Slam still lacks any collateral damage properties.
Special Move customization was added in Super Smash Bros. 4. These are the variations:
Koopa Hopping is a technique in Brawl that allows Bowser to jump continuously from platforms without the delay of landing. This is achieved by inputting a jump during a Flying Slam just before landing. Hopping increases Bowser's airborne mobility, allowing him to fade in and out with aerials or Flying Slams.
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