A neighbor (Ricky Watson) publicly admitting calling the police and reporting "shots fired":
The two charges that left me scratching my head were:
PUBLIC INTOXICATION and UNLAWFUL CARRYING OF HANDGUN BY LICENSE HOLDER
Both of these seem to necessarily require behavior occurring on public property.
How could this occur on private property?
Maybe Sammie Vail met officers on the (public) street at the end of his driveway?
The gun charge is an automatic if the person is intoxicated with a concealed or nonconcealed gun:
PENAL CODE CHAPTER 46. WEAPONS
(d) A license holder commits an offense if, while intoxicated, the license holder carries a handgun under the authority of Subchapter H, Chapter 411, Government Code, regardless of whether the handgun is concealed or carried in a shoulder or belt holster.