It is often used to describe a swift, decisive attack or a moment of intense action where something incredibly powerful happens very quickly.
The term is used in various contexts, including:
* Martial arts: It refers to a powerful and fast attack that overwhelms the opponent.
* Literature and storytelling: It can be used to describe a dramatic turning point or a sudden change in the narrative.
* Metaphorically: It can be applied to any situation where something significant occurs in a short period of time.
So, while there's no single perfect English equivalent, "tenchi issen" evokes the feeling of a powerful, fleeting moment of action, like a flash of lightning or a sudden explosion.