He suspects his life would be easier if he fully believed her. If, for instance, he didn't remember her very easily convincing him to hand over some candy. As it is... Russell kneads his forehead with a hand, ducking around a tree branch.

"Yeah, that sounds like an echo," he lets out after a minute. "Especially if you don't remember the details of it. Unless you were a terror in Reception." He could believe that, certainly.