Books
Get a shot off fast. This upsets him long enough to let you make your second shot perfect.
— Robert Heinlein · Time Enough for Love

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Speed comes first here: fire quickly to rattle the opponent. That brief disruption buys time to place the second shot with care. It's a tactical view of shooting where the first shot is a distraction and the second is the real one.
Context reviewed