is it possible for a player to control their opponent's character or something to move them against their will? cuz that just happened in a room to me.

No, you might ahve gotten disconnected and sent back to singleplayer.

hmm cuz i know i wasn't controlling my character and it was making moves i didn't tell it to.

Did you have any script on?

nope, it also steered my crotch directly into the path of the armcannon shot

shall i post replay? it'll show the moves that aren't mine

It usually happens when the player you were fighting before gets AFK kicked or something. Then you'll start glitching and it'll change your moves entirely.

into the path of the current shot? but the person before did go afk so it was probably just awful luck. oh well.

Blam made a script, which makes it... o.0.

this happend to me also my arms all of a sudden decided to rip them selves off lol

yea, it's just a glitch. it's happened to me at least twice.