So Michael, what exactly will happen if the group of naughty pupils spitting at people over the balconies in the shopping centre, simply walk away shouting abuse (or give the Head a good kicking for their trouble). What happens to the Head if they decide to restrain one or more of these children and end up rolling round on the ground or lash out when the whole confrontation gets out of hand. Does Headmistress Slim really have the same set of powers as Headmaster Bruiser or will we just pretend that they do?
Wait a minute... we are assuming that Heads would actually want to get involved in disciplining their pupils outside school (although personally I would rather start a fight with a bunch of hoodlums than wander round a shopping centre any day). Would it lead to Heads feeling obliged to sort out shopping mall mischief and as a result finding the perfect excuse never to venture into them. What happens if the Head just chooses to walk on by, ignoring their ill-behaved learners.
Funniest of all, what happens when an enthusiastic Head starts to give hell to a group peeing in the fountain only to discover that they are not in fact pupils from their school?