Marvin got to the spot he searched for without incident and got Harry out of the car and did with him as planned. Things didn't feel too good once he was done with his deed but then what choice did he have. In a way Sarah was right he knew - if he brought more people to her the risk for discovery was greater. He still had her promises that it wouldn't require too many people more before she would be healthy enough to move around on her own in the end she was the one that mattered and that she would live another day.