reflecting gun off of himself

Even if the sight was off by a bit, Accelerator was skilled enough to easily hit his target.
But that changed when the target was using a hostage as a shield.
There were problems that could be dealt with using intuition and there were one’s that
couldn’t.
“I see. This certainly is an interesting situation.”
“Well? What will you do?”
“This.”
As he said that, Accelerator turned the gun towards his own temple.
Before Kill Point could think, Accelerator unhesitatingly pulled the trigger.
A gunshot rang out.
“Gh...Ahhhhhhhh!?”
Kill Point’s body was knocked backwards.
A dark red hole had opened in his shoulder. He tried to brace himself, but he still
collapsed onto the ground.
Accelerator had altered the vector of the bullet he had shot himself in the head with so
that it headed towards Kill Point.
He motioned his handgun to the side telling the railroad worker to move out of the way.
The railroad worker fled to the side so hurriedly he almost fell and Accelerator aimed his
gun forward again.
“Looks like the sight really is off.” He put his finger on the trigger. “But I can correct for
that by altering its vector when it hits me. A gun sight is nothing compared to the
accuracy of my power.”

- Toaru Majutsu no Index Volume 15, Chapter 2 Part 12