My own thoughts are just be yourself. The PA is an expert manipulator, they must win any battle, don't engage in 'fighting fire with fire'. I think if they initiate contact just respond normally. If you decide not to initiate contact that's fine.
Remember the PA lacks empathy and genuinely may not always realize the emotional effect on you of their actions. They cannot see, or admit that they have caused your distress They will however take any rejection as validation of their hidden anger towards you.
Set firm limits for yourself. Stick to them like glue. State them repeatedly. Use ‘I messages' to share feelings of disappointment.
All you can do is let them know the effect of their actions on your feelings and emotions. They will either take it on board or they won't but don't stop trying.
For example if I was ever upset with my W over her behavior and it came out as anger at the way she made me feel ,I think she took that as a criticism of her and plotted (consciously or sub-consciously?) the next PA maneuver as punishment.
Hidden anger is never good, I am sometimes guilty of hiding my anger until it boils over, but then it is upfront and visible. This is part of the problem with dealing with PA, any anger or upset or distress in you really looks like criticism to the PA, as the find i hard to empathize.
I personally know I need to work on myself as well to ensure I am not pouring fuel on the flames and are appropriately assertive.
