There was an explosive noise. It was the sound of the giant ice anchor exploding a few kilometers away while it was caught on Fiamma. It was not just an explosion caused by gunpowder. Hundreds of meter-long ice stakes were created in the explosion. The tips of the ice stakes were sharper than a steel spear and thousands upon thousands of them continued to explode outwards in every direction. The ground was gouged out and a large amount of snow and black soil was blown into the air. It was fortunate that the surrounding area was wilderness. With those numbers and that destructive force, even an underground shelter would have been turned to Swiss cheese.

[...]

The shattered ice flew in every direction in clumps a few meters long. One of those directions was towards the plaza Kamijou and the others were in. It was like a bombardment of shells. Multiple buildings were crushed and the people in the plaza lay on the ground covering their heads with their hands. Screams and shouts could be heard in response to the unreasonable disaster.

Toaru Majutsu no Index vol.20