Chapters 3 - 5

I just finished reading 3 more chapters (3, 4, 5), and now I'm a little confused. I don't understand what Matty's power is, and I don't think he does yet either. It's like he can give life to other creatures. But where does the power, or life, come from? Is it from his own body or from somewhere else? What happens if Seer finds out? Would he know what it is and why it's happening? Would anyone know? I think that his power will help him a lot, but it may also hurt him. After all, just using it on a frog (now I know why it's different) and two dogs had exhausted him.