Good. The "youths" deserved that beat-up.
Morter attacks tend to make a man real pi$$ed off.Hunkered down in a hole or a shelter gritting your teeth as the rounds come in, adrenalin pumping with nothing to do but grit teeth.
By the nature of their conduct, it would seem that the Brits who did the kicking must have thought that some of these "youths" were acting as artillery observers for the Islamofascists on their morter station.