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Later Teaching Career
Though Slughorn’s charms and hexes kept him a few steps ahead of the Death
Eaters, they were insufficient to keep him concealed from Albus Dumbledore,
who finally ran him to ground in the village of Budleigh Babberton, where
Slughorn had commandeered a Muggle dwelling. The Headmaster was not
fooled by the disguise that had hoodwinked Yaxley, and asked Slughorn to
return to Hogwarts as a teacher. As an added inducement, Dumbledore had
brought along Harry Potter, whom Slughorn now met for the first time: the
most famous student Hogwarts had ever seen, he was also the son of one of
Slughorn’s all-time favourite students, Lily Evans.
Although initially resistant, Slughorn could not resist the combined
allure of a safe place of residence and of Harry himself, who had a glamour
that exceeded even Tom Riddle’s. Slughorn suspected that Dumbledore might
have a further motive, but was confident that he could resist Dumbledore’s
attempts to wheedle out of him any assistance he might have given Lord
Voldemort. He armed himself against this eventuality by preparing a fake
‘memory’ of the night that Riddle had approached him with a request to be
taught about Horcruxes.
Slughorn resumed his post as Potions master at Hogwarts with gusto,
once again instituting the Slug Club and attempting to collect all the most
talented or well-connected students of the day. As Dumbledore had expected
and intended, Slughorn was captivated by Harry Potter, whom he believed
(erroneously) to be supremely talented in his own subject. Harry finally
succeeded in prising from Slughorn the true memory of his Horcrux
conversation with Riddle, after using Slughorn’s own potion against him:
Felix Felicis, which made Harry irresistibly lucky.