(USPS4) Not a game-breaking bug, more of an artistic oversight : when you use Horrific Visage in the Metal I solo during the segment where Red Death is converting people to metal before the Mirror Master fight, they turn back into their original non-metal selves when the HV effect wears off. It's like you cured them by turning them into twisted little goblins, except they're still insane and trying to kill you.