Someone else is 'actually wrong' about something, I am 'actually right' about something.
i.e. based on the situation, on the ego level, somebody actually has made some mistake that's obvious, I know it's obviously a mistake, and then I start to have an ego reaction.
Because the whole 'setup' of the situation seems to have 'truth' all over it, I don't suspect that it's a trap/temptation and I don't realize that I'm STILL trying to be 'right', in the spiritual sense, because on the ego level I AM 'technically' right.
So it's sort of like a blind spot. Just because someone is mistaken about something, and just because I know how and why they are mistaken, doesn't mean it's my position to be 'righteous' toward them.
So then there's this challenge.... to be 'not right' even when you are. Even when all the evidence says yes, it's totally clear that the other person is wrong about this, EVEN THEN... we have to discern and be honest and step back and drop the argument. Otherwise if I defend the rightness, it will just become an ego attack.
It's a sneaky one. It's much easier to catch the ego when I am clearly wrong in some way, much harder when it all seems totally justified.