idk if this has already been discovered but suppose i'll post it here anyway.

if you stand in-line/just behind mr x's left arm he can never hit you. In this example i get hit a few times cos i suck but if you stay in the right place there is no way for him to hit you. Also because you are so close to him all the time, there is no way for him to do his charge/insta kill attack

srry for the lag footage just wanted to put it out here