So, I'm online trying to get 5 stars with my crew...and I came across an NPC FIB Cop who just wouldn't die.
Threw a grenade at him...he fell down got back up.
Shot him up with a Combat MG...he fell down got back up.
Shot him in the head with the Heavy Sniper...fell down got back up.
Is this a new thing they're doing? Once you get so many stars the cops go into God Mode?