In Street Figher x Tekken they introduced a game mechanic that when one of your characters is below 10% health you can sacrifice that character and go into Pandora mode. That means for a certain amount of time you have an unlimited amount of meter and you can use your super at any time. But it’s only available for a limited amount of time.
Throughout my time of playing this game never found it useful ever. Except for this one time, this one time only, I actually used it at the right time and pulled it off.