Clarissa - COM3
The man (let’s call him A) who gets it, is thinking it through. He knows that if he has a white hat, one of the others (B) is looking at a white and a black hat. That person will then think of themselves and think “I can’t have a white hat because if I did, then (C) would have shouted already because they’d see two white hats” so by the fact that C is still thinking it through, it means A doesn’t have a white hat.
I hope that makes sense