If Allison really didn't know where Kate was then she was of no use to the Hales. But if Stiles wanted her to stay, and Derek said no, he would have a problem on his hands. Luckily, it wasn't his decision to make, and he said as much. "Not my call," he replied, shrugging one shoulder. "Laura's the Alpha. As head of our pack, she decides if your presence here would endanger us. The snow destroyed your trail, so she won't be able to track you that way, but if she had your blood, or hair...a nail clipping. She could hire someone to use magic to track you that way."