That much of a pause gives Ryoji plenty of time to see that something is Not Right with the situation. The girl is Bound, he can tell that- which is good, because if Thanatos saw someone who wasn't messing around with a Gate he would throw a fit. The boy... he doesn't know what's up with him. He's kind of in the middle of dead or alive, which is not a place anyone should rightfully exist in. "Still, sorry," he says, with another careless smile before he 'spots' the girl searching. "Did you lose something?"

He knows quite well what she's looking for, and one look at him should let her know that- but he knows enough about secrecy not to say anything openly.