Free-Fall Kombat was a gameplay mechanic introduced and so far only featured in Mortal Kombat vs. DC Universe.
The mechanic is used as a part transitioning into a new section of the arena the players are fighting on. Free-Fall Kombat is activated automatically after throwing the opponent to a lower level in the arena. The player can fight in the air during the fall building up their super bar, and when a player's super bar fills, they can activate a powerful character specific move which slams the opponent into the ground, ultimately ending the sequence. The winner of Free-Fall Kombat will not take any damage.