It was pretty unexpected, but I love Kamiya's reaction here. Even though he doesn't agree with Koichi's choices, he's not necessarily negating them -- after all, growth is an inconsistent and winding road.
By challenging Koichi, who would otherwise try to keep his distance, Kamiya is continuing to connect with him, and I hope it'll keep Koichi from going down a completely self-destructive path when his emotional self can no longer tolerate being suppressed.