2nd tier U20 line. All good until, at a free kick, one of the wall put their arm over their face and blocked the ball. Seen by everyone, big shouts, waved away by the ref who then had a running argument with a couple of players - that went on a while, involved a coach and carried on after the game. Ref dug himself a big hole by saying protecting your face is allowed in law, while one player said repeatedly that it isn't. Torture to watch. All could have been avoided if the ref had given the wall - any wall - instructions in this game. I've learnt to tell adults and over 16s: hands over your families or chest is OK, over your face is not. This game was nearly a disaster for omitting that.