Snape and Harrys scar

[houyhnhnm102]

No: HPFGUIDX 139613

biggee_87:

> I dont know whether anyone has mentioned this 
> before but in Philosopher's Stone when Snape 
> first looks at Harry, Harry's scar starts to hurt.
[...]

houyhnhnm:

This incident sets up Harry's distrust of Snape, as well as arrousing
the reader's suspicions against Snape because we are supposed to
believe that it is Snape who is after the Philosopher's Stone.

However, nowhere else do we read of Harry's scar hurting in Snape's
presence except during the Occlumency lessons, when Snape's use of
Legilimency opens Harry's mind up to Voldemort.  Neither do we read of
Harry's scar hurting when he is around Quirrel.

Therefore I suspect that Snape was Legilimencing Harry when he stared
at him during the feast.  Because Snape was sitting right next to
QuirrelMort at the time, he opened Harry's mind to Voldemort.

My question is what did Snape make of Harry's reaction (clapping his
hand to his forehead).  Did he note it?  Could it have led him to
suspect Voldemort's possession of Quirrel during the PS/SS school
year, contrary to his assertion to Bellatrix?  Or could it have
advanced his own speculations about the connection between Harry and
Voldemort and the nature of the scar?