As Robert finishes his spell, the thrashing and struggling stops. The only noises coming from the weasel are a barely audible but peaceful breathing. It's safe to assume it's now sleeping deeply, at least until the magic expires.
If you are careful with your handling, you should be ok to open up the (now rather torn) shirt and examine or release the weasel without it waking prematurely.
Kerri:
[sblock]From the weasel's reaction you think it was hostile because it's meal was interrupted. If it were to awake without anyone else near it, or if it was released somewhere else (not near the bodies), you don't think it would go out of it's way to attack again.[/sblock]