Well, somewhere in all of this it said that the officers "tackled" the brother to subdue him. That doesn't lead one to believe he was dead. On the other hand, I think somewhere else it said that they shot him, so....
I'm not sure what you're getting at, but it's a fact that Tamerlan left the scene alive. He died in the hospital.
The ER doctors didn't seem to think he was run over either. How confusing.