Duelling

Duelling is a form of escapism.
It involves the use of 2 long objects of any kind and an imaginative mind.
The rules of play may differ and there is no standard because that's not what escapism is. Places of play may include the classroom corridor.
How to play? Explaining things cannot seem to contain the enthusiasm I possess, so I will give an analogy.
A:Expelliarmus!
B:Reducto!
A:Expelliarmus!
B:Reducto!
A:Avada Kadavra!
B:(caught)

and B loses.

Of course this involves breaking 2 rules
-No use of underage magic in the Muggle world
-No magic in the corridors

And this is all geek.