manipulated bloodflow to live

“So this is all?” Aiwass said looking down at Accelerator who was lying in the middle of a
pool of blood.
A normal person would certainly have died, but Accelerator was still breathing. He was
subconsciously using his vector transformation ability to circulate his blood between the
broken blood vessels. Due to this, streams of red liquid were flowing around him like a
drink spilled in outer space.
But that was it.
He was just barely managing to hold onto his life. He could do nothing more to revive
himself.

- Toaru Majutsu no Index Volume 19, Chapter 4 Part 3