Here is what we did.
After the two wings couldn't figure out what they had I asked if I needed to signal TD or first down going the other direction. So I ended up signalling first down for the other team and the explanation we gave to the coach was that the ball was last seen at the line of scrimmage and we lost sight of it from there. No official ever seen the ball break the plane of the GL. He wasn't happy and his argument was we also didn't see the runner down and the ball could have been lost after being in the end zone. That ruling didn't feel right and I felt like I should have signaled TD as that would have been much easier to explain.
After the game was over we are walking off the field and we see this fan coming toward us. At first look, considering the direction they were coming from, we assumed it was a fan from the winning team, and he was on a path right toward my L. The guy had a few choice words to the L from a distance (most of which I agreed with), there were some deputies right there and they were on this guy pretty quickly and slammed him up against a fence and cuffed him up.