Apparently, David Runningwater had discovered that he was the ringleader of those mean old cattle rustlers on the loose, because the cattle rustlers thought that the easiest way to fool any border guards who were on patrol with their scheme was just to buy the border guards's co-operation.
They were stealing the cattle from all across the southern border.
Stolen cattle as the Phantom Herd of Cattle
The cattle rustlers were disguising their stolen cattle and the drivers as the ghost herd of Peter Crossbones's ghost, by using the legend of the ghost of Peter Crossbones to cover up their crime.
Texas / Mexico border
Area De Control (Senor Ramos's place)
Cattle rustlers' hideout
Rozum sobers up somewhat for "The Phantom Herd." His method for creating the illusion of spectral haunting is original and fits into a fairplay mystery. The characterization paints Shaggy and Scooby as less buffoonish. Scooby contributes an important debunking clue, and Shaggy isn't quite so scared of the ghost cow concept until he sees their eerie mosey well depicted by Leo Batic.
I can't help myself. I love Scooby-Doo. This issue of the comic book is as good as the best of the original Scooby-Doo, Where Are You? series. It's reassuring to know that somewhere out there a group of "meddling kids and their dumb dog" are foiling the schemes of crooks everywhere.