Leader of the Pack

Darting quickly through the kitchen, you fling open the back door, looking at your barn in the moonlight, about fifty metres away. Whatever is going on in there, your sheep are not happy about it, judging by the commotion inside.

Suddenly, to your right, you catch sight of something running away from your barn, back towards a nearby forest that is about two-hundred metres away. You deduce that it is a WOLF, and it appears to have one of your lambs in its mouth! Will you: