District Three, more formally known as Insane Strife, is a nasty, goopy sewer system. This is how many a Heartless travel from one place to another for this place has no lights. It is dark and damp and full of disgusting sewer water that probably has some toxic waste in it. Having a fight down here really wouldn't be good for anyone because the smell alone will knock you out. Of course, if you put that aside it's still not a good place to hold out battle but a giant rat or two never stopped anyone from duking it out before. Why should it stop them now?