Defender on line on inbounds

[bard]

8th grade boys, 6 seconds left, game tied. B inbounding near division line across from table, and I'm trail. Before handing the ball to B1, I gesture along the line saying, "Watch the line, boys."

During the inbounds, which went to 4 seconds, A1 steps on part of the line after a pass fake from B. I judge it is inconsequential. B1 finally throws the ball in, A1 deflects it, A2 grabs it and sends it down to A3 who very nearly blows the layup, but A wins a close one!

How close to you all call the defender stepping on the line?

Also, in the 4th quarter, I "no call a foul" while A player is shooting. (I saw no contact.) The A coach yells, "Aw come one. You've been perfect so far. Don't blow it now!" I'm wondering if I should take this as a complement??? ;-)