Oh, this?

[Erwin lifts his hand and examines it, his eyebrows rising like he's surprised at the sight. He blinks a few times, flexing his fingers, then lets loose with a deep belly laugh.]

It's not mine.

[He cheerfully hands Rapunzel his coat.]

The reindeer out there are so demanding, don't you think? Some of them need some firm guidance to know how to behave.