Consider a 14U match...
Blue 2 is a defender who is crossing the ball to Blue 3.
Blue 1, the keeper, steps forward and picks up the ball.
You blew the whistle when Blue 1 touched the ball.
Blue 1 glares over to you: "Incredible! Red 3 was all over me, I couldn't see anything and couldn't move. Now I get called?"
You hear "offsides" being said by a few sideline parents and Blue coach.
Red coach is shouting to their midfield to move up for a Penalty Kick.
Your club linesman, a Red parent runs on to the field and tells you Red 3 was offside.
Play is stopped, both teams are becoming restless and looking to you.