I imagine there is a serious amount of abilities in this game that this works on, maybe even every charged ability just particularly bad on pain battery because it is 1 second cooldown due to the cooldown effectively being his health pool - when abilities go to rank 0 they get reset to default...
Just had this in my game, can we just start mass reporting this shit. Team was so fucking stupid they blamed me for losing to this guy btw. 2 players in the entire lobby managed to correctly identify the bug abusing asshole, 1 guy fucking laned into this freak and couldn't identify the abuse...