We had this one a few years back.
Team A 3rd and 10 from their 30.
A34 receives the ball on a handoff, runs to the side, turns around, eventually is back to the 22 and is pulled down by the facemask where he loses the ball. B60 recovers at the 20, runs to the 5, and himself is hauled down by a horse collar, fumbles the ball and it's recovered by A at their 5.
That year, the horse-collar was ignored as the player fumbled the ball before being pulled completely to the ground. It's since changed.
So, we picked up the horse-collar flag, and gave A the option of result of the play (1st and 10 at their own 5), or marking off the 15-yard facemask (3rd and 3 at the 37).
We were was wrong back then (see if you can spot it), and today the horse-collar would add new options.