[He doesn't have a spare gun, and he's not about to hand over his sword -- it was Treville's, and he's not going to risk that breaking, too -- or his knife, so instead he moves forward, putting himself between the monster and Sebastian. Somewhat instinctively on his part, considering that despite his loathing for Sebastian, he's always going to step in to protect people--
He doesn't really have a chance to think about it when the monster dives towards them both and Porthos does a similar move to Sebastian. Only this time, when the monster attacks, Porthos reaches out and blocks the attack with relative ease, almost unnatural ease even. Especially with the creature's jaw getting snapped back.
Needless to say, Porthos looks stunned. He knows he's strong, in general, but not this strong...]