Question: What animal power did Newt have, bursting into flames, and what animal power did the girl that turned into ice have?
Question: Why does Costner change the shotgun shells when the shell in the gun looked intact?
Answer: He did not bring the shotgun from Peter's. It was on the Weyboy's porch and the shells in the shotgun had been shot. He put fresh shotgun shells in.
Answer: Their power is thermoregulation. I don't think it's stated which animal it came from, but any animal that thermal regulates (i.e. warm blooded animal).
Bishop73