His other hand was under the table, so he didn't stop himself from tapping his fingers on his leg as he thought. Definitely a miss. Ryusei couldn't actually tell whether this person was lying or not. Not that lying was much of an indicator of anything, considering other circumstances here. Someone could be perfectly sincere and still be wrong.

If he accepted certain things as a condition....

No, he still couldn't do that. He stuffed some food into his mouth so as not to seem like he was thinking too hard, then after swallowing, asked, "How long have you been stuck here?"