metal pipe bone

Then a metal pipe about the thickness of a thumb that was used for propane gas rolled
along the dirty ground.
Hamazura Shiage did not hesitate.
“!!”
He grabbed the L-shaped pipe and swung it forcefully to the side.

It hit the piece of shit with the golf club in the ankle and Hamazura felt the guys’ bone
crack. The idiot fell to the ground screaming and Hamazura stood up covered in blood
as if to replace him. He swung the pipe down again getting another blow in.
The other two delinquents yelled something, but Hamazura ignored them.
He swung the pipe down yet again on the collapsed guy and pleasant screams entered
his ears.

- Toaru Majutsu no Index Volume 15, Chapter 4 Part 1