Coaches understanding LGP

[bainsey]

JV G today, lopsided game, visitors defeated home handily. (Varsity game was similar.)

Coach H had a little difficulty understanding LGP. My partner had a charge against H on in the first half, and I had two charges on H in the second half. For both of my calls, the defender was moving backwards at the time of contact, but LGP was established. I'll give Coach H credit for being patient (he's not working with much, only eight players), but he looked like he needed an explanation, so I provided one after I reported the foul...

Coach: "I just don't understand...."
Me: "Sure, the defender established LGP, and maintained it moving backwards."
Coach: "Were her feet set?"
Me (wincing a little): "That's a myth, Coach. That whole 'set' thing is a myth."

With that, I take off for the other end-line.

I'm not crazy about this exchange, for two reasons. First, as soon as the coach said "set," he lost me. We don't have time to conduct clinics here. Second, I actually said "LGP" (the initials, not the term) and that must have confused him. I used refspeak, and I believe the wrong choice here.

Question 1: Who has a better, concise explanation that reaches coaches who have bought into the "set" myth?

Question 2: What's it going to take to eradicate this myth? We're not taking about an obscure rule here; LGP understanding is fundamental to block/charge.