Secondly you can also clearly see 3 tubes going to the temple in the pic, which would preclude it from being the one HCG used. I'm starting to guess a little here, but when you watch the pred take off his bio, I definitely don't see him pull 3 tubes out of his temple. I think maybe they had him wear the stunt bio most of the time (and therefore a halfmask underneath) simply so KPH could see what he was doing. The only time they dressed him in the full face mask, and therefore the hero, was for the big reveal. It's possible this may be one of the times when the lines between 'stunt' and 'hero' props has gotten a little blurred.