There isn't very much room in the wagon, or Dain would put a little distance between them, for Tuo's sake. Fear is an impulse dedicated to survival, to seeking safety by any means necessary, and distance can help someone to feel safe. Distance is often all Dain can give.

As it stands, he stays very still himself, hands in the air -- not quite above his head, but certainly where Tuo can see them, empty and palms up.

"You're safe with me," he says. Quiet, sure, and simple, appealing to emotion, not to logic, ending with a promise. "You will always be safe with me."