Jo raised a brow as the Doctor seemed to gain momentarily control of the body. She had never actually seen it before, not in person at least. There had been Sam's quick post when he had been possessed but in person was another story.
It was a quick control though and she easily snapped back into a more defensive stance. As Sam moved so did she, breaking off slightly to move in on the other side of the Doctor. Yes, because knocking out a demon is always the easiest of things to do. She caught Sam's eye and she unscrewed the cap of the flask. She figured out of the two of them, he with the gun to pistol whip and her with the still bandaged up arm courtesy of one large smelly wolf, that he was probably the one able to do the actual knocking out and she sent a splash of water onto the Doctor again, hopefully giving Sam enough of a window to give a good hit on the Doctor.