Speaking as a CHL instructor in the Dallas are, and very familiar with the neighborhood in which this shooting took place, it's very likely that the GJ will No Bill this shooting. That's based on my experiences both as a former DPD officer, and instructor and a person who is very in touch with the general attitude of the region towards these types of issues. That means what I'm saying doesn't apply to Philly, Miami, Atlanta or anywhere else.. so huge grains of salt are in order for anyone not in North Texas.
Those of you speaking about the DA, forget about it. Irrelevant. The case is going to the GJ. Now, the DA may walk into the GJ and tell them he has no intent of seeking a conviction, but it's the GJs decision.
Now, why am I saying that this case is very likely to be a No Bill?
1) The North Texas/ DFW Metroplex area is currently very pro-self defense. Anything that even looks like a person may have been set upon unfairly swings public opinion towards the person defending themselves. Remember, this is the town that ran respected reporter Rebecca Aguilar out of town on a rail after she appeared hostile to a man who used lethal force to defend his property. Note as above, other locations don't have the same attitude, even in Texas.
2) Before being shot, the assailant was assaulting multiple persons that he apparently had no history with or prior contact. Even though the GJ doesn't get to hear from defense counsel, it won't be hard to put into their minds that the sort of person that does such a thing is dangerously violent, possibly putting a reasonable person in fear of their lives.
3)
More information. I know, I'm cheating now. Witnesses say that after the assailant was shot the first time, he tried to re-engage the person with the gun and was shot again. "Help help, I'm being attacked by a lunatic!" is becoming a strong and stronger defense here.
Note: Again, a large part of this relies on the attitude of the local populace and the people likely to compose a GJ here.
The deciding factor here is likely to be the part where the altercation moved outside and how much of it is on tape. If the tapes show the shooter leaving the store and being pursued before the shooting, opinion and the GJ will sway in his favor. If on the other hand, it shows the assailant leaving the store and the shooter pursing him to shoot him, he's in trouble.
**Disclaimer** There may be evidence we don't know yet that may change my opinion on this matter latter. Such as, if the video shows that the leaving the store part was the white guy going to get his gun from the truck and coming back... he's screwed.
And no, none of the above should be taken as advice to act in the same manner. Every altercation is different and must be acted upon based on the information available to the actors a the time of the shooting. If you ever find yourself telling an investigator, "Well, I though I was okay to shoot him because once Clicky told me a story on the internet..." You're screwed.