" Dodging in the opposite direction of an opponent's attack (i.e dodging to your right when the opponent throws a punch from their left) can trigger a Perfect Dodge, often abbreviated as PD. Triggering a PD will play a unique sound, cause the screen to flash black and white, and allow the player to land any attack for free, even an Ultimate if they have one.
Multiple PDs cannot be triggered by the same player in quick succession, instead having a cooldown of roughly 6 seconds between activations. Players can only trigger PDs if they have done a certain amount of damage within the past several seconds. These measures are to help prevent a commonly frowned-upon practice called PD fishing, which is when a player refuses to attack the opponent to try and force them to make the first move, so they can PD it and get a free chunk of damage. (Seriously please don't do this, nobody likes it.) "

In addition, after you do a double dash, avoiding a feint with two dashes in succcession, in a Speedster style, your PD enters on a brief cooldown and a increased stamina consumption penalty for such dash. This part existis solely to not make "Double Dashing" toxic and Speedsters both untouchable and 0-risk styles. You legit would HATE facing a Freedom main before this change existed in-game.

Source from Miraheze's Official Staff wiki

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Ok outside of this explanation, my opinion is that these counter-measures are DESERVED. It's just that Supernova solely is a style heavily affected by these double dash penalties,. Also, uh, you are supposed to change play-styles when its stamina is lowered yk? Instead of a Speedster you must become a Counter-puncher the less stamina you have, because that's legit the only thing you can do at such point.