While Lupin was still in werewolf form, Sirius made the solo decision to tell Dumbledore the secrets Lupin has been keeping since his school days. By the time the moon set and Lupin reverted to human form, Dumbledore had time to realize that Lupin had roamed Hogwarts and Hogsmeade in werewolf form as a student, lied about this to Dumbledore, withheld information about Sirius when Lupin returned to teach, and finally, roamed the grounds again in werewolf form as a teacher. It would not have been fun to be Lupin during that morning’s job performance review with his employer. We can see that
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