reflection spell

Behind me, the loup-garou howled in frustration and began to throw itself about. It must have scraped enough of the blood off of its paws, because it then tore through the wall of bars in two seconds flat and rushed after me.
I took up my staff and spun to face the creature, planting my feet on the floor, holding the ash wood before me. "Tornarius!" I thundered, thrusting my staff upward, and the thing threw itself at me in a rush of power and mass.
My aim was to reflect the loup-garou's own power and momentum back against it, force equals mass times acceleration, et cetera, but I had underestimated just how much power the thing had. It overloaded my limits and we split the difference. The creature slammed against a solid force in the air that canceled its momentum and flung it to the floor.
Approximately equal force was also applied to me - but I was probably a fifth of the mass of the loup-garou. I was flung back through the air like a piece of popcorn in a sudden wind, all the way to where the hall turned the corner to lead down to Special Investigations. I hit the floor before I hit the wall, thankfully, bounced, rolled, and slapped into the wall at last, grateful to be at a stop and aching all over. I had lost my staff in the tumble. The tile floor was cool against my cheek.


Fool Moon Chapter 17, Page 202-204