Day is still going to try and support him!! He might be a bit spooked but then he'll be concerned and ask if Riku needs company or someone to talk to.

(And my plan is that while Daylight is interacting with others during the event and he's seemingly not affected by it, his exposure from the others will mean he's more likely to catch the effects from them. And whoever he spends the most time with will also influence the lights he gets. >:3c Like: if he interacts with more red-light affected folks than blue-affected individuals, he'll eventually catch red faster.

Slow burn horror is best horror.)