(Ok I admit that any normal human couldn't have done that, but he aint a normal human. He's  a marine and an augmented one at that, therefore making him a super marine. Then theres the fact that the jungle on the island is very dangerous and that makes you even better at survival, combat, and hiding. Now read it again I was never trying to kill brand and descaling is a bit much I never hacked him up. I hit him and the axe stayed. The attack was not ment to kill it was ment to keep brand from resisting what Havoc was doing.)