Agreed.
Sideline control is your responsibility as a wing, and if diplomacy doesn't accomplish that task quickly, you have other arrows in your quiver.
First one's free.
Just curious, was it this guy?
"In my day, you didn't have sideline warnings. The referees didn't even have flags, they had horns, and if they blew one near you, you went deaf and that's the way it was! You were walking around, getting out of your coaches' box, knocking over the linesman and losing your hearing and that's the way it was and you liked it!"