When my "lead" drops to 10 yds.
Now that I'm a R, those interception returns depend on where the interception happens. Downfield, it might be a while before I even realize what's going on since I'm focusing on the QB. If it's near the line, I'm most likely turning immediately but I still have to watch the play. So I try to widen away from the ball while I'm running to get the best look I can.

I'd tell him he has to get closer to that type play. If the runner is OOB, he should be at the close hash while the play is alive. Once the runner goes out he has to close quickly to the ball, especially if you have opposing players in the team box. If he's standing around in the middle of the field or even worse at the far hash, at best he's out of position, at worst he's simply not doing his job.

We usually make this switch at the 15 and in.

Maybe this is a mechanical difference, but anytime the ball is outside of the 10 yard line, the goal line is the BJ's responsibility in my mechanics. It only changes to the end line when at the 10 or closer to the goal line.

Now that might mean that I (as BJ) would have to make sure a play near the sideline is not ruled out by the wing officials before it crosses. But the BJ goes up with the signal and rules on TD, no TD because the wings are not likely to be there.

Peace

Things like that often vary according to assoc "rule". Around here the rule of thumb is inside the 15 the BJ goes to the end line. That can vary slightly according to type of play expected at the BJ's discretion just so long as he lets the HL/LJ know what's going on.

I think that's what I was trying to say.