Instructions
Crouch down in a corner and get into a defensive stance. This allows you to duck quickly, but it takes a few minutes to return to the upright standing position.
Ask another person to dive onto your player when you are prone in the corner. The two players will crouch down on the corner on top of each other. Your energy will drop, as if you are dying.
Ask your teammates to revive you and your partner back to life. Kill the zombies that appear shortly after with your team. Once this is complete you will find more power ups.