Now that I think about it, this was how Gren sorta lost his first battle against Indigo. While Gren could generate a hella lot of force riding the recoil of The God Eater, Indigo put a little barrier right in front of Gren's hand. Gren was going fast and hard, but that barrier was strong enough, and small enough, that it needed only to resist the palm of Gren's hand. Gren's hand was destroyed since it essentially got Swisscheesed. Fortunately for him he has extra hands to use, otherwise that would have been much bloodier....