I'm getting the feeling Burk just lost all his magic... which is to say, nothing.

I really want to see how he signed it

Seeing strange imagery or hearing noises? All in a day's work in Burk-o-vision mode. So, yeah, nothing unusual.

@Whim: Pretty sure he signed it "Burk." What else would he put?

Maybe a sketch of himself in addition to his name. But the one thing we know for sure about Burk is that he's Burk.