>>21404543[UNNNNNNNNNNNNGGGGGHHHHHHHHH!]
"Holy...FUCK!"
Mewtwo X is completely done in point blank by a shot of pure, undiluted death. The beam overtakes his entire body before he can even properly react to it, stunlocking him in place while racking up an incredibly high amount of damage.
[IM.....POSSI....B-]
The life-draining attack climaxes in a final push, a booming knockback so forceful that it launches Mewtwo X straight into the ground, forming a deep crater to contain him in. For a while afterward, he stays there, damaged to the nth degree, barely even moving.
A) Proceed to overkill.
B) Give it a rest and confront him.