I think that this is a textbook example of measured response from a CCWer. He attempted to end the encounter nonviolently until the scum robbing him tried to kill him. It seems a good case against the ANTI argument that CCWers are all trigger-happy yahoos.
No, this is an example of some yahoo with a gun and a Lincoln pickup truck getting really, really damn lucky. Apparently they shot at him. This means they were trying to kill him, and he was fortunate that the criminals were poor shots. His delayed response was not "measured response" it was "delayed response".
If someone is committing armed robbery against you, you are not a "trigger-happy yahoo" to shoot him with prejudice, immediately.
And I don't know about you, but having someone take anywhere from a full year's worth of my time and labor (down to a couple months' worth - or hell, maybe 2 years' worth, I don't know how much a Lincoln Mark costs) by force seems like something worthy of defending with lethal force.