Dean saw the unfamiliar woman walking down the road, and in a moment he took in her odd clothing as well as the sort of 'lost' vive she was giving out. She had all the looks of a new arrival. Remembering how kind Sarah had been to help him get oriented when he first arrived, Dean pulled the Impala over to the side of the road and got out. The moment he got out, her period piece clothing became that much more apparent. It was good, he thought, that he stopped, as she would probably be easy prey for whatever evil ugly thing happened along.