OPI on quick "screen"

[Rich]

We had a play last night I want to run past this august group.

A has 3rd and 10 on their own 8 yard line. Quarterback takes a quick drop and throws a quick screen to his left (line judge side). From my vantage point, it was somewhere around the line of scrimmage. Before the ball arrived, an A player clearly picked off a B player to enable the catch and run, which resulted in a first down.

We have a 5-man crew. Who *can* make the determination that the pass was beyond the line of scrimmage and, therefore, deserving of an OPI call?

The reason I ask this is because the pass and catch happened right in front of the line judge and I think he was too close to the catch to properly see the pick and also too close to determine whether the pass was behind, in, or beyond the line of scrimmage. This led to quite the discussion in the locker room after the game, BTW.

So, guys....anyone see a role here for anyone besides the LJ?