Rip, missed this and day got hammered when I was asleep
I'm still here, just got off work lol
Psycho Mantis's Iconic move is actually to read your controller's input, and to beat him you have to swap your PS1 Controller to the Player 2 port where he can't read your actions.
I'd assume him to be the one that did that weird upside down vote thing for Tpein, or more likely to see Hero actions that are incoming and possibly stop or redirect them