Toaru Majutsu no Index Wiki

The 4koma depicting Harumi using the esper power.

Fire Thrower (火炎放射ファイアスロアー Kaen Hōsha (Faia Suroā)?, lit. "Blaze Emission") is an esper power that scatter flames as if it is an extension to one's arm. It is possibly a variety of Pyrokinesis.[1]

The only appearance of this power is in a 4-koma in the 2nd volume of the Toaru Kagaku no Railgun manga, where it is used by Kiyama Harumi through her Multi-Skill ability for the purpose of comedy.[1]