Is it possible for ISTps to be argumentative

[mikemex]

I used to argue a lot with one of my SLI friends. But strangely enough, he'd come around and make room for my point of view, which at the time I found really bizarre because he had stated his opinion so firmly only 2 minutes before.

It might sound a strange, but there are two persons living inside every head. At any given time you only use (consciously) four functions and the remaining four operate silently, being our hidden dual. If what an external dual says just "clicks", it is simply because it resonates with what our hidden dual is thinking.

[jewels]

It might sound a strange, but there are two persons living inside every head. At any given time you only use (consciously) four functions and the remaining four operate silently, being our hidden dual. If what an external dual says just "clicks", it is simply because it resonates with what our hidden dual is thinking.

Can you explain this more? What does "hidden dual" mean?