How do INTJ react when someone is provoking them?

It depends.

In the intellectual arena, the provoker ought to hope they have a watertight argument because INTJs often take great pleasure in slaughtering an inferior or untenable position. INTJs also don’t seem to pick losing battles in general, so they may be resistant to provocation when they know they can’t win – which is rare because INTJs tend to discard any argument that doesn’t have facts and logic on its side. The only time you’ll outsmart one there is if the INTJ has filled themselves with incorrect or ideological information, or is immature enough to believe certain fallacies that tend to be proven wrong with time and experience.

Mind games don’t work on them, really. They don’t like to play mind games. If they see someone doing it, they tend to realize quickly and refuse to play. Some will take up the challenge if sufficiently riled, after learning their tormentor’s weaknesses. Emotional manipulators beware – you had better be immune to your own venom, because INTJs can play that game too if they want to. People who like to belittle or insult for a rise also better beware that they can handle what they dish out. INTJs really don’t give a damn about an enemy’s feelings, once you have become the enemy.

Interesting thing about INTJs is they do have an innate sense of fairness and justice that is somewhat child-like. So, treat an INTJ well and they will treat you well, in reciprocation (their internal innocence has no reason not to); but abuse an INTJ and they will never forget it nor forgive it – when you violate the child-like trust of the INTJs internal self, then you’re shut out forever. If you subject them to endless torment, they will despise you and hope you meet a most unfortunate end, and they won’t feel an ounce of shame for that. An enemy is literally dead to an INTJ.

In the case of physical confrontation and provocation, INTJs are well aware of the risks of engagement and seem to avoid physical confrontation if they don’t feel up to it. However, provokers should know the INTJ has a beast mode if you push them too far. You really don’t want to find out what it looks like or what it is capable of.