Ken doesn't respond. He's either passed out or gone to sleep waiting for Chikusa; he seems to have moved or wriggled Chikusa's jacket up so that the fabric's almost pressed to his nose, which may account for his being able to relax enough for sleep. If it's not sleep...well, he's got more than enough excuses for simply passing out.

He looks worse than before, somehow. Perhaps because any form of unconsciousness looks uncomfortably like death when someone's in a bad enough physical state.