It goes without saying that your goal should always be to not get involved in any sort of a street fight. It’s best to just deescalate the situation by talking with the other side; or, if that fails, to excuse yourself and walk away.
However, you might find yourself in situations in which you just can’t find a way out from. In that case, thise back take to choke sequence shown by Joel Bouhey– could be of help for your self-defense.
Joel Bouhey starts off from the mount position. As his opponent is covering, Joel shows how to turn him over to the side and how to trap the arm, turn them on their stomach without being able to defend the incoming choke.
This is evolved Self Defense Jiu-Jitsu!