nit picking calls-violations

[oc]

I am still replaying a situation that happened months ago in my head-please give some advice on how you would call it.

MS boys 7th grade game. I am the T for a free throw. After the shooter has the ball I see a kid form the opposing team standing on the 3 point line. I don't know why I didn't see it earlier as I usually watch for this and 'coach' the kids to avoid these minor violations, before the ball is passed to the shooter. I put up my hand and signal a delayed violation and call it after shooter misses the shot. Now I knew at the time this is a nit-picking call and I took some heat for it from Coach B.


Would you call it? does it depend on the level-Middle school, jv, Var?
-If no, what do you do if Coach A also saw it and asks. It was minor but obvious. "Sorry coach but I didn't think it was that important so I ignored it."

-Wouldn't the HS coach for team B rather the ref calls it and the kids learn and not make the same mistake later? Interested in opinions from refs as well as coaches who are on this board.