Hmm, I was probably aiming away from him mimicking humans or vampires for that matter, in fact I'm sorry but vampires didn't even cross my mind as an option :O In my mind that kind of shapeshifting is different but I see what you mean :S If I'd of put animal mimicry or beast mimicry I'm guessing it would have been the same. The idea of him being able to is a rather interesting one, and I would be willing to accept it as a challenge with all the rules you stated. 

As for Serena I realized my mistake there with that >.< I have gone through an altered it, though can probably change it this evening if you would prefer, I worded it terribly!