I don't know about INTP's in general, but when backed into a corner, I turn beast mode.
Only happened twice ever in my life. I am very passive, never get into fights at all, never get openly frustrated or any of the sort. But there has been two incidents in my life in which I couldn't get out being my passive self.
One led to a full out fight of which I am rather not reminded too much. Sure I was the one that walked away from it, but there weren't any winners tbh.
Another time could have gotten worse, since the odds were quite against me, but luckily didn't escalate. Due to my company, I often find myself driving the taxi or busses and although I rarily have incidents with customers/drunkards, probably because of my calm and collective way of dealing with people being stupid. For example, drunkard tries to play with the meter, and I warn them to stop or drop them off in the middle of the forest, and finish it with a joke like 'at the place where terrorbunnies roam and feed on drunk people.. I am serious.' in a complete straight face. And people almost always back off after such remarks.
But anyways, this one time I ran into a bad bunch, was with a 4 seater, they ordered the taxi for 4 people, I drove to the pick up spot and they were suddenly with 5, not 4. Now fact of the matter is, that should anything happen while transporting 5 people in a 4 seater, no insurance will pay out and the company would lose its permits, so under no circumstances would I ever put 5 people in a 4 seater. Which is what I told them, but they started getting agitated. Then one pushed me, and I just went wacko. It lasted no longer than like 30 seconds, but my voice which is normally fairly soft and collected, carried quite loudly over theirs and instead of moving away I moved toward any threat I perceived, threats were made about beating me to a pulp, stealing my carkey and go to their destination without me and such, there was much pushing and cursing going on. It was basicly me vs three of them in a push and shout contest, until a fourth interrupted and broke us off. It felt like it was seconds away from becoming a punchfest..
Anyhow, it broke off and they went back inside their house. I was so on edge that I didn't notice the fifth actually got in the car during the confusion. He apologized for the behaviour of his friends and still wanted to go to the destination so at least I left with a paying customer.
All is well that ends well I suppose.
Anyhow, I'm not sure if this is type related. Or just testosterone/adrenaline related. But back me in a corner and I become blind to the consequences and won't back down. And I actually hate that about me. I'm just glad I am not easy to back into a corner. :>