6 man mechanics questions

[mikesears]

I was working a semi-pro game two weeks ago as part of a 6-man crew. This league uses NFL rules (no modifications).

I was HL and we had a 3/G from the B-8. I am watching my key (TE) at the snap and read pass. I continued to watch the TE and the deep wing guy throws a flag. After the play, he calls an illegal contact foul because the DB was continuing contact after 5 yards. I didn't see it because I wasn't watching the outside reciever. After the foul was administered, I was scolded by the deep guy on my side for not helping him out with the call. He said, "I have no idea where 5 yards is so I need your help". I really wanted to say back to him, "That's why these lines are on the field" but I refrained.

My question: Should I be helping with the outside recievers, and if so, when do I begin helping after the snap?