Okay, i call this the "Infinite heart bug" or "wrong heart illuminated bug", this only happens when you are in Wing, the heart can be damaged only by one of the wing-mans but the other ones can't damage it because it is either lagging or the wrong heart is being showed by the game, this makes the game impossible to win, and more if you are planning to kill something big (like medusa or hydra) risking the player to be destroyed by a bug and ruining the experience.