What has stuck in my mind lately has been that in the images after the shooting, he’s face down. At the same time (forgive the graphic nature here), he clearly bled for quite a bit.

Dead people don’t bleed. And while yes, if major arteries were hit he could bleed out relatively quickly, most indications I’ve seen are that it still takes 1-2 minutes.

It’s pretty clear then that it took them longer than you would hope to check on his status.