um...birdman?

So..I went onto Crossfire china out of boredom today and normally entered a MM room.
As soon as I was turned into a mutant this guy (still human) chased after me and was stabbing me.
Doesn't sound too out of the ordinary right?
Well this kid started freaking jumping WAY high and his arms spread out..just like a BIRD.
I'm sure it was a hack cause this guy killed me fast but wth? A bird?
He also did it when he was a mutant but i couldn't ss it



UPDATE;
another ss.