What Accel does

“Re...flection...!?”
“Sorry, that’s not entirely wrong, but it still doesn’t get to the essence of what I can do!”
The girl somehow tried to distance herself from the boy, but her body would not do what
she told it to due to the electrical attack she herself had fired.
“The answer is vector transformation! Motion, heat, electricity. I can alter any kind of
vector that touches my skin. I have it set to reflect by default, though!”

- Toaru Majutsu no Index Volume 3, Chapter 2 Part 5