#1 Both wrestlers brawl out of the arena and disappear
It's a Falls Count Anywhere match. That lends itself to tons of wrestling and fighting away from the ring. If they use the stipulation to their advantage, it means that they would keep the action away from the ring as much as possible. This could lead to a mysterious ending. Both wrestlers fight wildly, Brawling up the entrance ramp or to another arena exit that leads backstage. They fight through the backstage area, all over the building, and eventually, the cameras can no longer find them.
They can search for the competitors for a little while before finally coming to an exit door that's left partially open, but somehow impossible to get through, no matter what they try. The match has to be called off because the participants have disappeared into the darkness and are unable to be found.
This might sit better with fans than having both men disappear after a Wyatt Family attack, and certainly would be received better than a referee costing the champion the match. It may not be a perfect ending, but it's certainly fitting of the stipulation, and the chaotic nature they could create would possibly be fantastic. Because they can tape the backstage fighting before the show, it would allow them to make edits and cuts, add effects and do whatever they want in order to make the whole scene more insane. A properly done job could come across as having been done so well that even though the popular Fiend Bray Wyatt doesn't get the Universal Title, people still think it was cool, and the overall segment gets people talking.
It feels like outside of Rollins picking up the victory, some version of this is the most plausible outcome that could actually occur at the Crown Jewel PPV event.
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