Riku has tried not to look directly at either of them, because he's aware of what the light does to his transformed eyes and it reminds him of... things he isn't proud of, but has nevertheless accepted as a part of who he is. He can't help it at that, though, briefly they shine like two newly minted gold coins split down their centers, like a feline caught in a photograph.

He looks away, conflicted. About what he could say, whether he should, whether he isn't just making this harder on himself than it needs to be, whether his conscience and his heart would have let him refuse when they showed up at the door. No, Riku feels miserable, his grief barely scabbed over before he's scraped it raw again, but maybe that's just life, or the afterlife, when you're the one lagging behind.

As usual, there's a lot more going on behind a brief pause and clenched fists.

"Be more careful." Not that he could under the circumstances. It just needed to be said.