[HPFGU-Movie] Re: quirrell-new?

[Tandy, Heidi]

It never says in PS/SS that it's Quirrell's first year teaching, although
Percy's line was changed slightly for no discernable reason. 
I always had the impression that he'd been teaching at Hogwarts for at least
a year before Harry started- probably from Hagrid's description that he's
"scared of the students"-how could he know that if there hadn't been
discussion of how he taught the students?