Willow Wolf snapped...she lost everything...her base and her friends. She won't lose anyone else. She still had you but now...she's overprotective and possessive...willing to kill anyone or any infected without a second thought or question...She was not taking anymore chances. Although she wouldn't show this side and kept it hidden from you...right now, Willow is looking for a new place to make a base.

Willow Wolf: "Alright...the sun is almost down and no luck. Just great, and it seems it will snow soon. How perfect."