Bounce is a mechanic that can be used during a combo to extend the combo and reset IPS. It can either be triggered by hitting an opponent into the ground or hitting the opponent into the wall. You can either Groundbounce or Wallbounce during a combo, but not both.
Groundbounce
A Groundbounce is a type of Bounce that is triggered by hitting the opponent into the ground. After doing so they will be stuck on the ground for a brief period of time allowing you to continue your combo.
Wallbounce
A Wallbounce is a type of Bounce triggered by hitting the opponent into a wall. They will take one extra hit and be knocked back toward you so you can continue your combo.