To Ralph, Michelle's speech seemed to be a desperate attempt to get them to trust her. After what she'd just done, though, Ralph trusted her about as far as he could throw her. He was worried about her escaping at first, but the stone wall that Tony put up didn't seem easy to break through. There was also the fact that Michelle was unable to use magic. As long as they were careful, she wasn't going anywhere.

"I'm going to get some rest." Ralph said. "Whoever's got the first watch, wake me up when you get tired and I'll take over."
He picked a spot against one of the walls of the cave, and closed his eyes. He had been through a lot today. It was hard to believe it had only been one day since this whole thing started. So much had happened, and he had a feeling that tomorrow would be just as eventful.