“Are you suggesting someone who showed no sign of understanding the arrangement of our GD tarot can skip straight past visions and accomplish a summoning using a Telesma-level ceremony? Mathers, if we want to avoid losing this promising young man, we should put a stop to this ceremony right this instant. Or barring that, we should at least prepare an exorcising sword in preparation for when he inevitably loses control of the dark forces.”

[...]

Westcott quickly pulled away the tablecloth that bore the magic circle drawn in pigeon’s blood, but the same pattern had been scorched onto the ceremonial ground’s floor. It was inorganic, but it had such persistence. It was like something invisible had stuck its hand through the gap of a partially opened door and was trying to force it the rest of the way open.

[...]

The wind did not calm down, but it gained clear directionality. It wrapped around in a fierce whirlwind as if to contain itself within the magic circle scorched onto the floor. Thanks to that, it maintained the intensity of its power, but it was compact and stable. A formless being was held within the circle and trapped like a fairy tale demon. The stage was set and it would have to answer any of the magic user’s commands.

Toaru Majutsu no Index New Testament vol.18 ch.3 pt.6