Crossword puzzle clue "needing quick action"

Needing quick action

It doesn't convey ferocious fuel-burning action, action, action! when it's regular-sized

A quick left and a quick right

A quick snort followed by a quick puff?

Command for quick action

Quick action in an emergency

Piece of the action, or a shout that stops the action

Who said "Action may not always bring happiness, but there is no happiness without action."