Did they try talking? Yes, the story says the man ignored all verbal commands. Did they try non-lethal force? Yes, the man was tazered to no effect. So this was clearly not an impulsive "shoot first" scenario.
Lets look at the man, he was acting violently (the story says he was smashing up the store). If he was identified, the police likely know his past convictions, if any (granted that part is speculation). He was armed with a deadly weapon. The description of a crow bar hardly does justice to something that apears about a meter in length, with a large head on it.
Now we have a man with a deadly weapon, ignoring police commands, not affected by a tazer, trying to leave the area. Two officers are working a clear covering pattern, one with a pistol, the other apears to be using his belt (putting away tazer, getting pepper spray or cuffs, it is not clear) The man begins to swing at the distracted officer, who apears to be within reach of the weapon. Officer two defends with deadly force.
Use of force has 2 sides here, appropriate and minimal force. Using deadly force to protect another from a possibly deadly attack is appropriate. Note that if that weapon hit the officer in the head, he would very likely die. Also note that non lethal force was used earlier. The use of minimal force issue is not as easily satisfied. It requires use of no more force than needed to stop the attack. This is broken with the subsequent shots. After the man is taken down with the first volley, the attack was over, and no more shots should have been fired, also giving a chance for paramedics to possibly save him. (unless there was further action we could not see that warrented it)
The last thing I would touch on, though it has been mentioned already, is non lethal shooting. This is not trained. Ever. With good reason. These situations require action. In simplest terms the less choices, the better. Choice 1, what do I use to stop this attack? Choice 2, there is no choice 2, stop the attack already. If lethal force is decided, lethal force is used. I could write pages on why it is not appropriate to train on non lethal shots.
One more note, while I was in the army, we too were trained to shoot at center mass with one exception. that being anti armour drills, where we go for 2 in the chest, target doesnt go down, aim for head or thigh untill it does.