The abuser triggers the fight/flight response in the victim. Eventually the lines can blur between the two.

I’m not sure about showing signs of psycho and sociopathology. Personally, I’ve been doing lots of fighting/flighting but not negative behavior to any of those degrees.

If you had met this person and was thinking about pursuing them for a relationship, and you saw they exhibit these traits, would you still be interested in pursuing? You need to self protect what you allow yourself to be subjected to in relationships, IMHO.

The best way you can help as a friend is to encourage them to get professional help.