What’s more, Quirrell is a master legilimens; if he’s willing to pull off a Groundhog Day attack on her he might as well just read her mind and get it right the first try. There’s no point in wasting time, magic, and risk of getting caught when you could just do the job perfectly in 30 seconds.
Having one’s mind read for the first time seems to leave some kind of trace; if he’s not sure she’s ever had her mind read before he shouldn’t try it because then Dumbledore or Snape could learn later that someone’s been peeking.
This seems to be borne out by the events of Chapter 79:
Albus said heavily, “A person who looked like Madam McJorgenson told us that a single Legilimens had lightly touched Miss Granger’s mind some months ago. That is from January, Harry, when I communicated with Miss Granger about the matter of a certain Dementor.”
Even if Hat and Cloak is Quirrell, the job had to be done the hard way, without Legilimency.
Having one’s mind read for the first time seems to leave some kind of trace; if he’s not sure she’s ever had her mind read before he shouldn’t try it because then Dumbledore or Snape could learn later that someone’s been peeking.
This seems to be borne out by the events of Chapter 79:
Even if Hat and Cloak is Quirrell, the job had to be done the hard way, without Legilimency.