[Yep, he knows exactly what Kotetsu is talking about, and he'd been half hoping his partner wouldn't see it. But now that he has...]

Don't be ridiculous. As if I'd leave you out there with him.

[There's the sounds of him getting ready to leave in the background.]

I won't ask you to wait for me, I'd be wasting my breath. But try to be careful, won't you?