Let's talk about BPD and it's emotionality since my drunken mother just hit me with "you look like you're a psychopath" and then used me as a therapist yet again.
BPD is often caused by extreme neglect and trauma in the childhood of a person. This leads to certain emotional processes forming in the brain that cause extreme volatility, be it fear, shame, love, hate, sadness, it is never "normal". Because of that volatility I had learned many coping mechanisms to both help me when I'm in public due to my agoraphobia (it mixed with my volatility isn't fun) one of which is focusing on something and just day dreaming while not letting the real world affect me.
Another angle of this I had noticed is me being more authentic and more "me", through Text, such as this blog rather than using my own voice (I hate my fucking voice, I'm so insecure about it, just like everything else about my body that I was taught was wrong and ugly.)
I also notice Narcissistic Psychopaths actually vitimize BPD people by sniffing out the blood in the water (their vulnerable emotionality) and cause them to react to things. I've also noticed egotistical people do the same, but they're not much different. Same genetic predisposition for sadism I suppose. (In context of my recent blog post about the polish guy)