An act? Face spent time in a mental institution and Bushwick's insanity is documented on the track "ever so clear". Two of the three were/are str8 up nuts.
Let's not exaggerate now. Them dudes were also rapping about killing people and raping them you're right Bill & Scarface did have mental issues but they weren't on the Big Lurch level or anything. They were making horror flicks and gangster movies over beats yeah they did "Mind Playin Tricks" but for a lot of those other joints it was obvious there was a major level of exaggeration there.
Beside J. Prince ruled over them dudes with an iron fist THEY WASN'T THAT CRAZY or else they would have taken issue with that. Dude make them take a bootleg album cover flick of Bushwick Bill in the hospital after he shot himself lol. Big Mike was the one that flipped the f^ck out and I thought he was the cool one.
Redman wasn't doing much of that horror show sh!t it was more of a understandable level of mental instability. Schizophrenia, split personalities etc.