Seems to indicate that Quirrell casted some kind of spell on Harry at that point in Chapter 51.
That’s the telekinesis that allowed Harry to activate the time-turner. If Harry’s hypothesis about the sense of doom being magical disharmony is correct, then the creepiness would just be from getting close to one of Quirrell’s spells. And the subterfuge with the wand direction isn’t intended to fool Harry (who knew that Quirrell planned to cast telekinesis), but rather is Quirrell’s distrust of the privacy wards.
That’s the telekinesis that allowed Harry to activate the time-turner. If Harry’s hypothesis about the sense of doom being magical disharmony is correct, then the creepiness would just be from getting close to one of Quirrell’s spells. And the subterfuge with the wand direction isn’t intended to fool Harry (who knew that Quirrell planned to cast telekinesis), but rather is Quirrell’s distrust of the privacy wards.