Well...
Even if you shoot someone in the arm or leg, yes, there's always the chance you could hit something more vital, and/or they could bleed to death before EMT help arrives.
But I think the intent of Wilson is clearly established by the five previous shots that consistently shot Brown in non-vital areas, before he finally went for the instantly fatal head-shot (that again, the multiple autopsies confirm the shooting order of).
A normal and sane person would have stopped after being injured with the first shot, knowing that the officer could wound him further or kill him with the remaining rounds. As ultimately happened with Michael Brown.
Alternately, officer Wilson could have kept firing after Brown was down, out of fear or anger. But there are witnesses who support that Brown was advancing on Wilson. And witnesses to the contrary. What a mess...
