...Addie saw Doc approach Frank and jab him in the gut with what she believed was a large pistol of sorts. Addie, as you noted, was a reluctant witness. When Doc prodded Frank and then stepped back a couple of steps, it appears because the ranchers had not reached for their guns, Doc felt the need to provoke a response thinking Frank would go for his gun and therefore be the first shooter or provocative gunman. I admit that is a guess but a logical one considering that Addie said shots came from that immediate encounter and Frank immediately turned and staggered toward her or her general direction.
At least, that is the way I follow it. I find the witness testimony, as do you, quite reliable, except for the Earp side. They had a lot to lose, but then...I am not so sure about that. I think the Defense lawyer and Spicer were crooked as a dog's hind leg!
Jones, you can always depend on me to offer an alternative examination!
Thank you for your patience.
Frank's shock and response to being shot was what warned Tom to turn away as the shotgun came up at him. Frank did not turn away before being shot.
He did not stagger down the walkway, that was Tom right after. Frank made it, according to witnesses, across most of the street pulling his horse along. At some point he was able to stop, perhaps in holding the horse for support as it was acting up, and he turned to steady his gunhand to aim at Doc, who was approaching him still carrying the shotgun in hand.
There is no doubt Frank was gut-shot at the outset as Dr. Matthews described his belly would as well as the kill shot to the head. You don't get a gut shot in the back as you are moving away. There were only two shots initially, one from Doc, one from Morgan at Billy. That's when Frank turned and went to the street. The other side of the street was where his body was found.
I'd still like to know how Addie never mentioned Frank in the street, not even as he first turned toward her direction. She was very uncomfortable or very strictly rehearsed.