The Auror on the bed seemed remiss to talk for several moments; finally, he took a deep, shuddering breath and said, "Defodio, I think." His tone was both steady and wavering; the slight jitters in his inflections making it clear he was forcing himself to be calm with every fiber of his being.
Simon, whose face couldn't be seen by the young man, raised his eyebrows slightly, catching Anna's eye. It was the carefully trained reaction of a professional mediwizard; the reaction they were trained to have instead of going "Uh-oh."
Defodio wasn't intended for use against flesh; it was usually used to carve into stone. Against flesh...this kid was lucky to have his arm at all. It was like walking away from a high-speed collision with just bruises. Still, the fact it wasn't meant for use on flesh was actually good; that meant it didn't cause too many nasty effects from the spell's magic. Unlike some other spells, it just cut. Others boiled wounds, burnt flesh, or ate away at bone. And those were the simple after effects...
He nodded, almost imperceptibly, as she cast to slow the flow of blood. Simon drew his own wand, and pointed to the racks of potions behind him; a small syringe flew to his hand, full of a bluish fluid.
"You're going to lose feeling in your arm. Don't be alarmed," Simon spoke, gently, gesturing for Anna to come hold the injured arm. The injection was quick but not painless, and the boy jerked slightly as his skin was penetrated. Simon stepped away as he finished, nodding to Anna to begin healing in earnest. He stepped to the counter and opened the empty syringe; it popped open with a hiss and a small puff of bluish smoke.