He remembers a little of what had happened with Kanji during the vines. Something about being able to smell others? He doesn't want to leave Naoto like this, but he has a feeling that very soon Kanji will be coming their way anyway wither they want him to or not. Approaching him carefully might just leave him clues of who he is, and that's not a secret Ren's ready to share just yet.

"I'll take you down and whistle for his attention. Perhaps it might be better for me to leave after that...if you think that's a good idea."

Despite his own setbacks, he wasn't going to leave her helpless either. He'd be a terrible person if he did.