The wall the saw blade dug into bled. No. It was a soldier that had been transformed to look just like the wall. He burst open like a balloon, and blood and fat splattered across the wall and floor. It was likely some kind of ritual for better using the gold tool.

Before, Marian had sent that saw racing across that wall that was now covered in fresh gore to attack the soldiers.

Toaru Majutsu no Index New Testament vol.4 main.11