Some of my prior clients have had the misfortune to meet a VPBD K-9 in a "nonconsensual" encounter. If you ever find yourself in this position, don't. Just don't. Don't do anything. Don't run. Don't hide. Don't fight back.
Those dogs live for the moment they get to chase somebody. It's all they want to do. They enjoy doing it, and they get excited for it. But they only get to do it every so often. On those days, it's like a 5 year old going to Disney World. It's the highlight of their week. And if the person fights back at the end of the chase? Well, that's just icing on the cake. As far as the dog is concerned, the suspect is their new chew toy. Their reward for a job well done. The longer the fight, the happier the dog.