Actually, given that his power was to understand *any* language, with a bit of training, he could've learned to 'speak' body language AND then become one of the Mutant's best martial artist because he could theoretically 'read' his oponent's moves before he made them.
Also, for some reason that no one mentioned in that issue, the X-men's jumpsuits *are* bulletproof. So Doug should've been safe at that moment.