Two games of Street Fight going on at the same time.
Players 1, 2, A, B all meet up at a crossroads about the same time.
1 and 2 are opposed and have their victory conditions to get to opposite sides, while A and B have the same. But the Lose conditions stay the same. So super bloody fight in the middle with lots of chances for EXP.
Just a concept so far, but could be fun in higher end campaigns where you want to shed some blood.