gets hit with a bullet of '10 times power'

Several illusionary gunshots rang out in a row. It did not matter that the gun was flintlock.
If these had been actual lead bullets, there would have been nothing Kamijou could do.
But this was magic. That meant his surefire right hand would work against it. Having too
perfect an image of something could be both a good thing and a bad thing.
He deflected the bullets and moved right up to Aleister.
Or he should have.
“Spray.”
“Wha—?”
Kamijou’s confused voice did not actually leave his mouth as sound.
Before it could, an unpleasant cracking sound stabbed into him from the side. He doubled
over as an impact tore into his ribs. He had been running forward, but he was knocked
sideways. Blood burst from his mouth as he breathed. Unable to cry out or scream, he
rolled again and again across the invisible floor.
***
“The Blasting…Rod!! Is that what did it!?”
“It amplifies the magic’s power to ten times what the target thinks it is. That is the surest
and simplest symbol of power that my one absolute master, Allan Bennett, specialized in.
Although to avoid jealousy from foolish Westcott or Mathers, he disguised it as a trick that
sent the target’s refined magic power out of control to knock them unconscious without
harming them.”