Nope, I don't get it either, but it reminded me of one where the Cavalry are all lined up on parade inside the fort when the sentry shouts that there are Indians approaching.
The Captain asks for more detail and their cherokee scout goes down on all fours and presses his right ear to the ground.
After a short while he stands back up again and reports.
" There are approximately fifty approaching on horseback, Sir. Chief Running Deer is leading the party and is riding a white stallion."
"You can tell all this just by listening to them?", asks the Captain.
"No, Sir, I just knelt down and looked under the gate."