imperious
"Potter."
A wave of white hot pain drowns Harry for a moment, to a level that is near sickening. If he could spare the energy, Harry would be regretting everything good he's ever thought or said about flipping Mad-Eye Moody, ex-Auror extraordinaire. They ought to have added nutcase extraordinaire to the list of titles, he thinks spitefully, as the roaring in his head grows so loud it's all-consuming. The wall of the corridor is cool, and the only thing keeping him attached to reality.
"Potter," the voice hisses, now kneeling beside him, somehow over-riding the cacophony of pain building up within him.
Snape.
Four years of sheer dumb luck and it's clear he's finally run out.
"Sir," he mumbles, before daring to squint his eyes open. And yep, Snape is there, in all his black-robed, hooked-nosed, Potter-hating glory. Brilliant.
"What has happened?"
There's definitely something wrong now— seriously wrong, because Snape hasn't immediately placed him in the wrong and is that concern in his voice?
Harry blinks blearily, blinks away as much of the dancing spots of pain and threatening darkness he can before answering.
"Moody put me under the Imperius a bunch of times, until I threw it off."
"Of course," Snape says, along with muttered comments on 'barmy old coots' and 'mentally unstable chimpanzees'. Harry would wonder what the hell the man is going on about, only the pain wracking his body almost has him trembling, and he's trying very hard not to do that in front of Snape.
"Can you stand? Ah, never mind," Snape quickly amends. Harry had tried standing the moment Snape had uttered those first three words, only to soundly fall and crash onto his knees. A new wave of pain overwhelms him— Harry can feel the frayed ends of his very nerves burn, his knees throbbing along with the beating of his heart.
"Dobby!"
In the renewed roaring midst of his pain, Harry can still hear a loud pop, a quick exchange of words. A small hand clutches his, and then the floor fall as out from under him.
The world spins into darkness, and Harry collapses with it.