Thanks for the comments guys. I have to say that this was my favourite chapter to write so far, it just seemed to flow right off the keyboard. The "thing" inside Gary will be revealed in chapter 4, along with a few other surprises, and then the real action begins.
The feeding I have to say, was the one thing I was worried about. At the end of the day, it's akin to a starving man who will latch onto the first piece of food regardless of what it is, just to quell the hunger. It was no different here. As to whether he's lost his humanity, that's a tough one. I think that anyone who kills somebody loses part of themselves, so Gary is no different. Has he lost it entirely? Time will tell.
I'm not sure how that cliff-hanger got in there though, I blame my editor!!