It's just a disagreement on whether or not Metz should or should not have faceplanted because he shouldn't have been expecting to not land on top of Shin. It doesn't matter either way as I've already posted a reply, but it's still a disagreement.
Like I said I don't really see how it's fair to expect my character to fall over just because your character moved after the knife blow had already landed. That was his end goal. Now if you had tried to sidestep Metz rather than punching him I'd understand but you didn't so this is what happened for the situation to make logical sense. Ultimately Shin should have been bowled over there is really no way he could have moved out the way in time considering the type of strike Metz used meant his body would pretty much be in contact with shins as he struck. Still we're at neutral ground so whatever.