What makes you say that the blockade of traffic was only minutes? Is that a part of the report? That could be the case, but I don't think it is something that is obviously true. And if we assume to isolate the point that traffic was halted for a significant time, let's say an 2 hours, and the patient died in traffic, that there are many treatable injuries that have enough empirical evidence to be deemed treatable. I don't think it is a valid defense to say "Well, the person COULD have still died if he wasn't impeded to the hospital."
Let's use this as an example to further isolate the situation. I am at a park with a friend. We decide to walk up a hike and end up fairly isolated. My friend and I are attacked by a thief and my friend ends up getting stabbed. The thief runs away with my friend's phone. He needs immediate help. I am the only one that can call for help. Too bad for him, I am currently fixated on arguing in a thread on Neogaf. I put my need to argue on Neogaf over his well-being and refuse to find help or even call with my phone. After arguing for 2 hours, I call for help and my friend died from internal bleeding. The autopsy and doctor who called the time of death both rule that it is likely that my friend had a high chance of surviving if he had been treated more quickly. Should I be legally responsible for anything? Surely, the thief who stabbed him should be put to trial and pay for his crime, but what about me? Do I get to hide behind the fact that I didn't stab him or that there was still a chance that he could still die regardless?
Yes, I know this example is kind of goofy, but that doesn't change the point. My point is that one who plays a conscious role in preventing somebody from medical attention should have some level of accountability.