Movies
Why, you're crazy. Besides that, he's on a cliff where a whole army couldn't get at him.
— Jack Driscoll · King Kong

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker shoots down a wild idea by calling the other person crazy, then adds a practical reason: the target sits somewhere so high and unreachable that even a whole army couldn't get to it. It's blunt, exasperated reasoning meant to end the argument.
Context reviewed