It'd be stupid to ask if you checked Kanda's hair on Friday since it's not like you knew, but if it was obvious enough that it was Caelus to someone close to him maybe they were trying to cover for him.

That's a little insane, but seeing that we had two known instances of people acting fine and normal the following week after they killed, in Camille's case after a public monster meltdown, it isn't unthinkable.

Just insane behavior.