Quirrell and the Troll

[pickle_jimmy]

No: HPFGUIDX 58798

Scene 1: PS/SS - Everyone is in the Great Hall - Enter Quirrell

Harry was just helping himself to a baked potato when Professor 
Quirrell came sprinting into the hall, his turban askew and terror on 
his face. Everyone stared as he reached Professor Dumbledore's chair, 
slumped against the table, and gasped, "Troll -- in the dungeons -- 
thought you ought to know."
He then sank to the floor in a dead faint.


Scene 2: PS/SS - H&H are making their way to the Stone

A disgusting smell filled their nostrils, making both of them pull 
their robes up over their noses. Eyes watering, they saw, flat on the 
floor in front of them, a troll even larger than the one they had 
tackled, out cold with a bloody lump on its head.


Scene 3: PS/SS - Harry confronts Quirrell at the Mirror of Erised

Harry:    "You let the troll in?"
Quirrell: "Certainly. I have a special gift with trolls -- you must 
have seen what I did to the one in the chamber back there?"


Now my Question(s): 
Wouldn't the other staff have known what each one was doing to 
protect the stone - especially if it involved large three headed 
dogs, or stinky mountain trolls? 
And... If they knew about Quirrell's gift with trolls, wouldn't that 
raise questions regarding the earlier fainting episode? 
And... Why did he knock the troll out - surely if he'd just got round 
it it would have made a great rear-guard?

Pickle Jimmy