Yeah quite right, why would they instigate trouble, they're not on performance related pay. They don't work overtime for flat pay though, it's still time and a half. (Does your brother owe you money or summat?)
There are often skirmishes when the Police are nearby, because basically those involved are all gob and want to put on a show for their mates, knowing that the Police will intervene before it gets serious and they get a good hiding. A sort of 'hold me back, hold me back' scenario, often witnessed on a Saturday evening.