he had all intent to, until a potentially deadly weapon was pointed at him from close range, and he decided to use deadly force in defense.

I am not aware of the law in GA, but in NY for instance, a police officer can use deadly force to prevent escape from arrest of a fleeing felon in possession of a firearm or deadly weapon. I have to assume GA law has as much or more teeth than NY, and in GA a taser is defined as a firearm.

That says nothing of the defensive use of force that the officer clearly was engaged in, but speaks to the seriousness that the legislature puts on fleeing a felony arrest, specifically while in possession of a weapon. The officer was right to be in a heightened state, and was correct in administering the use of force he did. He was following the training that every police officer in this country is offered.