Story continues...
The mental attitude and the deliberate will caused me to be totally cleansed off of the demon's influence. Another night was so peaceful I haven't had for months. No explicit magic appeared to be required. Seems like the demon "revenged" himself after I talked (sent) to it: of my perspective on him. And he just quit embarassed... The power of word.

My observation from how demons and low ghosts act is that they have no actual intelligence - the creative mind. When you see their mental activity through, you may find out they are slaves of their darkness, circumstances coming out of their wrong perspective, limitations they actually chose.