Left 4 Dead 2: Secret "The Parish" Ending

If you wait for 15 minutes on the final map of "The Parish", Rescue 7 will actually leave without you and give you a game over...

[@Nach0s187]

This is the regular ending

[@mxrz2500]

where’s the secret?

[@UntiPa]

You lose, they just leave and detonante the bridge after 15 minutes

[@FullHitPoints]

Except it's fake. I literally just tested this myself after being told about this by a friend, and nothing happens. Additionally, while there are voice lines in the files that imply they will be starting their bombing run soon, they do not actually play in-game.