電光石火：でんこうせっか [den-kou-se-kka]

稲妻の光や石を打ったとき出る火の意から、動きが非常に素早いことのたとえ。また、非常に短い時間のたとえ。

The parable of the movements being very quick from the light of the lightning and the fire that comes out when stones are struck. Also a very short time of parables.