I did something like that once.
I had to try extra hard to give that guy the slip, but I managed. He didn't want to let me go, so as soon as I got away, I hid where he did not find me.
In that part of the city, you must get away, or the addicts will kidnap you and whore you out to get the money for their next fix. They are not known for civilized behaviour when they are in an extreme state of heroin addiction, and they will do just about anything to get their next fix.
So you must walk away as unscathed as possible.