It really amazes me how people react to different scenarios. I will not speak to what either man should have done only what I would have done. Remember, we are only watching a 2-minute segment of what I am sure is a long drawn out drama.
Just looking at the 2-miniute snippet, I think the shooting was unjustified - Morally unjustified.
Legally, especially in Texas, the event will be deemed a legal shoot due to their "stand your ground" law.
I have carried a handgun since I was 16. First a cap n' ball .36 caliber revolver. Then I moved onto a .22 LR Stoeger Luger pistol, then settled onto a 9mm Browning Hi-power. I carried that Browning for decades till I moved onto different EDC handguns. During those 49 or so years I only had to draw that weapon once to protect myself. That one time it ended well for both parties - Them & me.
I believe that I have a moral responsibility to not kill someone for money, property, etc. I will only draw a handgun or take a bead with a long rifle to protect life. Life, whether it be family, neighbor, a stranger standing in line at the ATM, etc. and of course me.
Thank the good Lord I live in a "stand your ground" state.