Board Thread:General Discussion/@comment-4913740-20130628164607/@comment-98.160.119.65-20140730221307

"i don't know why he attacked MSF when he wanted to kill Zero, maybe because since Big Boss also wanted to kill Zero, he tried to eliminate the other ones that get in his way to revenge?"

Skull Face wanted both Zero and Big Boss dead for something they presumebly did in the past.

If he's to be believed, he apparantly has some history with Big Boss and Zero.