Thanks for the mechanics help. I will verbalize to myself to stay put and let they play develop better. And yes, 2 fouls on the play, both declined.
I wouldn't say "stay put." When there is a live-ball turn-over, the R should be thinking that he should move toward the middle of the field, AND start retreating hard toward the defending team's goal line. Ideally, you will be on the goal line if/when the BC crosses. Those types of plays tend to migrate toward a sideline, so the middle of the field affords the greatest opportunity to 1) get/stay out of the way and 2) allow you to continue to officiate while getting/staying out of the way.
Yeah, that was going to be hard to do from your position at the moment the interception occurred, but that was because, as others have pointed out, you were way too close to the actors, and moving too hard downfield at that point. Avoid moving forward until the action has moved downfield, and the actors have all moved downfield. Keep a minimum 10-yard cushion to the nearest player, at all times while the ball is alive. Flow easily horizontally as necessary, but retreat toward A's goal line any time the action moves backward. If a QB drops back to pass, move away at a 45 degree angle from him, to keep your cushion, and put yourself "in the clear" should he start to scramble. If he scrambles, let him pass you toward the sideline, and be thinking of moving toward the middle of the field, so you'll be clear should he reverse course.
Don't get so wide that you get trapped near a sideline. Move back toward the middle of the field if you feel yourself getting 'pinched' toward a sideline.
But, I am with some others in that I truly believe that the guy that hit you saw an opportunity to 'pop' a referee, and then claim he was just trying to get to the BC. Well, guess what? Calling Turkey Turds on that, but it doesn't matter - you don't get to clobber an official, regardless of where he is. We are part of the game, and we can't evaporate. We do the best we can to stay out of the way, but, when we can't, that's just the breaks. Brush by, but you don't get to purposely take out an official.