Fake mushroom pickers detained by the police! Instead of baskets, they had backpacks full of boxing gear!
Fans of two rival soccer teams made an appointment in the forest to stage a little private fight. The police learnt about it and intervened because fighting in public is illegal in Poland. Even if they do it in the primeval forest, it is still a public place.
I think it is senseless to forbid it. Some young men are very energetic and need to let the steam off. Let them fight against each other in secluded places rather than allow them attack non-combatant people in streets.
In the past such men could easily join the army and enjoy life full of adrenaline in multiple European conflicts. And today? Nothing.