I recently had a conflict with a friend and have been under extreme stress unrelated to them.

They were invalidating my reality and perception of events, full blown gaslighting. Some fucked up behaviour too.

I think I went into Se demon.

I calmly used every single detail to destroy each of their point with a laser focus. Anytime they tried to misconstrue my words, I deconstructed their BS in a nanosecond.

The social harmony was instantly suspended on my side.

They no longer talk to me and seemed really upset. I am not.

Is this Se Demon or a Si grip?

not going into details of what the issues were, but pretty abusive behaviour