Used when someone takes quick action after being idle or not initially involved.

Sudden Urgency

Implies a burst of energy or enthusiasm while responding.

Energetic Response

Figurative language, not always a physical jump, but a quick start in doing something.

Often used in scenarios where a problem or danger prompts a quick response.

Suggests that one is prepared and attentive, ready to respond when necessary.

Can refer to mental processes or decision-making, not just physical action.