"She said it's not a prosthetic, it'd just be...a dummy that looks like the real thing, but completely useless. I won't be able to do anything with it, but...it'll at least buy me some time."

Enough time to formulate a better plan, anyway. He can walk around for a little while with the fake arm while he thinks up a strategy for the long term and how best to ease everyone in his life into it. Maybe come up with a decent excuse for it.

And thankfully, that reassurance that he'll be able to have some time to sort things out and breathe is enough to get James to calm down. If only just a little. It's the only thing he's been able to actually rely on in all the chaos so far.