If Sam had known that Jo was going to come along, he wasn't so sure if he'd have been so quick to use his ability. He was still more than self-conscious about using it in front of people. Elisabeth and Alessa had been the only people to see him use anything so far. And now Jo, it seemed. It was good that she was here though. Sam always welcomed help -- especially from the people that he was close with. At least he did in most situations. There were the few that he preferred to keep to himself.
"Glad you could make it," he responded, kneeling down to pick up his gun. His attention snapped back toward the Doctor as he momentarily gained control over himself (which was odd, considering that Sam hadn't seen anyone aside from himself manage to do something like that before), and Sam nodded off toward him. "You heard the man. Knock his ass out." Then he cautiously began to move toward him, holy water in hand as he went.