70 yard field goal ?

[tnroundballref]

I had a team attempt a 70 yard field goal last week. They had two botched punts earlier in the game and I guess the coach decided "What the heck....why not?" My question to the group is this : Where do the back judge and Line Judge line up at for this play? I had watched the kicker in warm-ups and had a pretty good idea that he couldn't boot one from that distance. The kick ended up going about 35 yards where R picked the ball up and advanced it 10 yards before being tackled by K. I (BJ) got into normal punt depth to make sure we had appropriate coverage....however, several officals in my association felt that we (BJ & LJ) should have been under the uprights to tell if the attempt was good. My argument against that is who is going to cover the return man, PSK, etc ? Thoughts and comments are welcomed.