Unusual Surface Delay
The Full Nelson is a behind the neck roly poly done while both hands are on top of the head. The footbag must both pass through both arm holds and pause to roll across the back of the neck.
Demonstration of a Full Nelson.
Keep both hands firmly on top of your head and create enough space for the footbag to pass through the arm openings.
Let the footbag roll smoothly across the back of your neck rather than trying to stop it in place.
As the bag exits the opposite arm opening, track it with your other foot and prepare for the toe stall.