kb,
It's good writing, but I found it a bit choppy, and it needs some proofreading. "living their carefree, unfathomably young life" (lives)
I found it unbelievable that a doctor would shoot someone to ask him what he was doing, and I think most people would recognize their brother even from behind. The beginning of ch. 4 jarred me, since we're all of a sudden presented with an omniscient narrator and a seemingly unrelated story. You're telling us something is about to happen, why not just "show" us with action as you had been doing?
And I don't know what this is:
“Ooh, close shot, Mari.”
Ashe’s words of encouragement did nothing to soothe her friend’s savage breast as one of the bullets glazed Mari’s cheek. Mari felt this no place for words of encouragement, nor for that matter any words at all.
Is Ashe complimenting Mari on her shooting? But Mari is the one getting shot. (and it should be "grazed," rather than "glazed," shouldn't it?) Do they shoot at police cadets in your world of 2009 during training?
My problem is with the motivation behind your character's actions. When somebody shoots out the window of a cop, she yells, "Hey?" That response seems rather lame. Then she picks the bullet off her dashboard and drives nonchalantly away? Things like that would make me stop reading.
So you didn't get a rave this time, but it's definitely good and the problems are easily fixed. Hope this is helpful crit.
Take care,
JohnB