Izuku twists his mouth dubiously at him, but there is a soft understanding in his eyes. He says nothing. He thinks there is plenty else a person could want: returning home, friends, a rewarding career, a nice vacation, world peace--et cetera. But there's no point stating the obvious when they both understand their situation in this strange nexus of a world.

"It's not really about filling my time... I just want to help. If I'm able, why shouldn't I?"

It could be a rhetorical question, as he's not looking at Krouse anymore. As the trees thin out, he squints at the beginnings of the makeshift city as he picks out the street where his path home might start.