Moving back toward Wei Wuxian's side he stops momentarily. The musical box, of the sort, seems to still be playing. Though he's also taken note of the metal handle at its side slowing. He is not sure that they want to know what will happen if the handle stops.

So he steps a little away, just in case something happens and to protect the other, before reaching out to the metal handle to start winding it until it can no longer wind before letting the handle go.