Here we go Again: Cop Shoots Unarmed Black Guy in the Back 5 Times in the back and Gets a Mistrial

This should have been a slam-dunk case because the cop is clearly shooting an unarmed man running away from him in the back.

A judge declared a mistrial Monday afternoon in the fatal shooting of an unarmed black man at the hands of a South Carolina former patrolman, after the jury said they could not come to a unanimous verdict.
In a statement read by Circuit Judge Clifton Newman, the jury said "We as the jury regret to inform the court" that they were unable to come "to a unanimous decision in the case of the state versus Michael Slager" after a day of questions and deliberation. 

How was one of the jurors deadlocked in this thing? The video clearly shows the cop shooting the guy running away from him 5 times like that scene in Band of Brothers. The video evidence was clear but there was still a mistrial. There should have been at least a verdict of manslaughter. In any case this really does look like there was no justice for poor Walter Scott.