There is a whole lot of hide, bone, and tendon in the way of a clean hit to just about all the vitals of a 'buff (water or cape won't make a damn bit of difference in this scenario) and an animal PO'ed enough to charge may be able to kill you even if he is dead and doesn't know it yet. Read that again. How long does it take for blood pressure in an adrenaline fueled charge by a 'buff to reach zero?

I bet it just might be long enough for you to die.

I guess after looking at the entire picture, as laid out by our hero, I will say, quietly, "I have my doubts" and leave it at that.
Best,
Ted