"Even if I had to let him go?" They can't very well knit a little scarf and hat for a hermit crab and Harry is fairly sure that they live somewhere warm. He'd seen a tank for one and it had a plastic palm tree, so that means they live somewhere nice.

As Remus gets his coat off, it's clear that Harry is a bit scratched up, but there's nothing seriously wrong. Most of the damage is to his clothing and not him. "No, I'm okay. S'nothing bad, not really. I just couldn't get out and I didn't want to make a bigger mess."