Videos - Battlemage and Wildhunter

So Spadow said this in one of his comments on the blog:

Hyper Body stacks with the increased HP from Beast’s Anger. When the buff of Beast’s Anger disappears, your HP won’t decrease until Hyper Body runs out.

Ehhh? Can anyone here confirm this?

That sounds kind of interesting, although so far it's looking like I could just make a full-hp bowmaster and have about the same combat effectiveness sans hb mule. They'll probably call it a glitch and fix it by making them not stack in the next kmst patch, without addressing the real issue with the class.