This is where you have to get out of the theory and into the real world. Old crumbling BX "protected" (term used loosely) by FPE breakers is a very dangerous situation,
A high impedance EGC is a dangerous situation, yes, but is 65amps into a fault always dangerous?
Thats what he said...in my professional opinion.
Which is why we have breakers and low impedance EGCs.Yes, everything works fine until there is a fault. That's when things can get ugly fast.
What about the supply pole pig and drop? Roughly.No idea, the routing of the cable was very convoluted through multiple j-boxes, and the cable disappeared into a finished ceiling on the other side of the basement. But couldn't be much longer than 40 to 50' from the panel to light.
If so, you just proved that BX is a poor EGC.