[Nagito can't help the little giggle that explodes out of him when Kel says he was lucky. But it's very brief.]

I don't think you'd like to hear the details, but I did take precautions beforehand. [If he's vague, maybe just the knowledge that Nagito didn't go into this entirely blind will make Kel feel better?] And I'm sure Ferryman-san would find me, if I really needed to be found! So you really don't need to worry.