That was a rough one to watch.
The officer on the left actually had a fairly decent/clear shot from what it looks like on the body camera... But it seems anymore they're trained to do mag dumps at something roughly resembling the center of mass. Now, I get that adrenaline, stress, etc makes that whole process a lot more complicated. But that's where training, training, and more training comes in. This was not a hostage shot where only 2 inches of the hostage takers head is visible. Pretty much his entire head is clear for the duration once he takes the hostage. Officer on the right had absolutely no clear shot.