Another episode in Texas last week of an armed citizen intervening in what police term a potential spree shooting.

One James Jones walked into the “Zona Caliente” sports bar in Arlington, got into an argument, and shot manager Cesar Perez,  killing him.

Then, a man – unnamed, except for the cops’ appelation “good samaritan” – with a carry permit shot Jones in the back an unnamed number of times.

Jones was carrying not one but two guns, one of them with its serial number filed off.  He had no carry permit.

The police were cautiously thankful, as usual in these situations:

“We’re thankful that the good ‘Samaritan’ acted quickly and decisively to end the threat,” Cook said. “We never recommend people get involved. That’s a personal decision that a citizen has to make.”

Use of force and firearms expert Emanuel Kapelsohn told NBC News that, from his understanding, the man who took down the shooter reacted appropriately.

“I think it’s to be applauded,” he said. “Not everybody in the world ought to own a gun. Not everybody in the world ought to carry a gun. Not everyone in the world ought to engage an armed criminal where innocent people could be potentially injured.”

“But this good Samaritan obviously had the ability to do what he did,” Kapelsohn added. “Who knows how many people would be dead if he had not acted?”

That’s twice in one week in Texas.