[ In all fairness, Peter had wondered the same thing when he heard the tasks and learned the reward the alchemist was willing to attach to it. ]

He's trying out some kinda potion. Experimental, I guess. He didn't want the responsibility of having to keep a marten alive and well in captivity if it doesn't turn out to be the ingredient he needs.

[ He waggles the fingers of his free hand at her. ]

Saves him from getting bitten.