You are entirely correct -- I got tunnel vision/brain fart and mixed NF and NR up, newbie mistake! NR is initialized to 1 on the first line, and is incremented

You are entirely correct -- I got tunnel vision/brain fart and mixed NF and NR up, newbie mistake! NR is initialized to 1 on the first line, and is incremented for every subsequent line read. So, in this case, the above pattern will match any line after the first.