Imagine cas dying in deans arms and the last words cas heard was “why dose everyone I love die” then cas’s breathing becomes very faint until it stops. Then flash forward to dean driving away from the place he just buried cas, which was next to his fathers grave. Then the camera sets onto the impala driving away into the sunset with sam and dean in the car. And as soon as they reach the cameras horizon the camera fades to black and dust in the wind plays.