Neither at lunch nor at dinner did Snape appear in the Great Hall, while Dumbledore sat dining with an air of complete composure.
Alistair borrowed the Marauder's Map from Harry and searched everywhere, only to find that Snape was not in Hogwarts at all, leaving him no choice but to rein in his thoughts.
Perhaps because Kingsley was staying at Hogwarts Castle on behalf of the Ministry of Magic, Dumbledore found it inconvenient to leave the school and thus had no option but to send Snape away.
Chapter 339