From The Grey House:
He had seen the carnage the vampires and werewolves caused freeing Natalia. He was on his way back to the cabin the night they arrived. He stayed back and watched and listened as the Slayers and his friends were easily killed. He couldn’t fight; he didn’t carry a weapon.
Dean looked down at the weapon he now carried and placed it on the ground next to him. He had probably doomed Judith. He could hear people above him on the roof. They were taking Judith. He shuddered. Dean knew what vampires were capable of and didn’t want to think about it too much.