Lonesome Dove- Garth Brooks question

In the song towards the end he's talking about the showdown with the kid and the outlaws who killed his dad. He sings,

"The shadows stretched across the land,
as the shots rang out down the Rio Grande.
When the smoke had finally cleared the street,
the men lay at the ranger's feet.
Legend tells to this very day,
that shot's were coming from an alley way.
But no one knows who held the gun,
there ain't no doubt if you ask someone... in Lonesome Dove."

Question: Who was doing the extra shooting? The mom or the kids dead father as a ghost or something.

Who do you think when you hear that part?

I know, I know... I should go ask someone in Lonesome Dove.

I always wonder that when I hear that song. Am I weird or has anyone else thought about this?

Lonesome Dove by The Garth