INTJ example - I looked and looked at the code and the issue could be here or here because of XYZ(theory). What do you think? Lets talk about this and see where the issue is.
ISTP response - Put a debug point and see what you get.
I can talk theory all day long, but at the end of they day reality is what leads to what is. This is usually followed by theory of what I think it is based on knowledge I have gained from past experience. This is different then ISTJ past experience as I dont say do XYZ...I will explain the principle behind what I believe is happening and why, but my "default" is "add debug points to see EXACTLY what is happening."
INTJs can be major head cases just like ISTJs. Its not like they cant go to reality, as in what is happening right now, but its not the way they naturally think.
ISTJ example - *Looks at car crash* I wonder what happened?
ISTP response - The car hit the pole
ISTJ - Smart ass...I bet they were talking on the phone
ISTP response - beats me, I have no idea.