Kronos guessed because Luke'd been through it, too, and Ethan was able to tell him exactly what happened from his perspective. Even if the wolves told, no one in the Red Room's done it so they might not be able to put the pieces together.

[Might not. But it's clear he's also kind of taking Nico's more pessimistic view of the situation. At least he has something of an answer for it.]

I can't change it now. I never stopped wearing armor anyway, I just still won't stop.