That's even more disturbing. Bad enough to ambush some LEOs, but then to wait around and fire on the first responders? Wow, that's a special kind of evil IMO.
I've been under fire more as a medic that I did working LEO.
30-30 to the radiator in a old Chevy van ambulance will drive up the pucker factor.
They didn't want us to render aid to the guy they already put the effort into shooting.