The way he described it, is that the new rule mainly pertains towards the corporals that just sit at the HQ while all the non-lethals push. In a situation like you described, I believe that it would be the usual "when an officer dies twice lethals are loaded."
I have always been told that The Office and Game of Thrones is a must watch, yet I still haven't seen a single episode xD
Brooklynn Nine Nine is the shit