Or he could have just cast the spell at any other time of his choosing prior to giving Harry the diary. For that matter, he could have not done it at all, since there’s no actual benefit to making the diary a Horcrux—he already has all the Horcruxes he needs, and it’s not like he can possess Harry anyway.
Or he could have just cast the spell at any other time of his choosing prior to giving Harry the diary. For that matter, he could have not done it at all, since there’s no actual benefit to making the diary a Horcrux—he already has all the Horcruxes he needs, and it’s not like he can possess Harry anyway.
Turns out I was quite wrong anyway.