"No one can help me", said Malfoy, crying, his whole body shaking, with Moaning Myrtle hanging about nearby, as reassuring as she could be in her... condition. "... He says he'll kill me..." Tears were rolling down Malfoy's face. Actual tears.
Malfoy wheeled around and drew his wand. Harry pulled out his own when Malfoy's hex went whizzing past him and broke a lamp on the wall beside him. Harry threw himself sideways, tried to cast a spell, but it was deflected. Moaning Myrtle cried for them both to stop, but neither of them even slowed. Another hex was cast, and the garbage bin behind Harry exploded. Harry also missed his target, hitting a faucet on the other side of Draco; water sprayed everywhere, much to Myrtle's displeasure.
When Malfoy began to say the words to the cruciatus curse, Harry said it. He said it, without really thinking.
"SECTUMSEMPRA!"
Blood. So much blood. It spurted from Malfoy's face, his chest, as though he'd been slashed with invisible swords. He staggered backwards and collapsed onto the floor with a great splash, his wand falling from his limp right hand.
"N-"
Here, the memory began to change, to waver. Colour flickered out of view, behind the windows, in the mirrors. Proof of inexperience.
Harry stepped up to Malfoy who sputtered, water quickly becoming red in an ever-growing circle around him, his robes matted with his own blood.
Harry's face twisted into a disturbed, delighted smile as he watched his opponent bleed on the floor, moments before Snape entered the washroom, his footsteps splashing ahead of him, warning of his arrival. Harry affixed a look of great distress and looked back at the professor who shoved him out of the way to tend to the wounded boy.