My daughter is a paramedic. Trust me, these guys did not try all that hard once the door was closed. They know dead when they see it.
I know a person who was a paramedic who was responsible for transporting a serial killer who was stabbed in prison. That ambulance barely went over the speed limit. No one was in a hurry.
This guy was dead for a while. It will be interesting to see what he did in the jail cell. Evidently it is common to throw soap on the floor to get it nice an slippery so you cannot stand up from your position. That will be a clue.
CPR brings truly dead people back to life only when very specific conditions exist. It accomplishes a few other things however. It gives family members false hope that their dead loved one might be “saved” on the way to the hospital. It helps maintain perfusion to vital organs that can then be “harvested” at the hospital. And most importantly it helps cities get voters to pass EMS levies which raise vast amounts of money that can be squandered on other things.
Then there's the other thing that's a convenient way to mess up a potential crime scene.
Whisking away an "injured" body messes up any evidence, by allowing the people to trample and disturb Lord knows what.
If he was pretty well dead, then scene gets preserved, and the M.E. & Co. gets called in to potentially find whatever, not to mention being a big PITA to the un-involved people at the site.
Now you have me wondering. Last month, I saw an ambulance driving along with its lights flashing, going significantly below the speed limit. In fact, it was pulling over to let traffic pass. That was one of the strangest things I have ever seen.