Whiff Punish

From Dustloop Wiki

Whiff Punish is the act of hitting the opponent during the recovery of their attack after it has whiffed.

Most attacks usually do not have enough recovery that you can plainly react to the opponent whiffing, then punish. Instead players will need to focus their attention to staying just outside of the opponent's attack range, then react to ANY attack with a whiff punish - usually whatever is their fastest attack that can reach the opponent.

Punish HUD

Most modern game HUDs show "Punish" when hitting a character during the recovery of their attacks. This is very useful for seeing if a player is actually whiff punishing or if their opponent simply was not blocking.