There is no such thing in Texas law about "brandishing a gun". Brandish is too open to interpretation and I am glad not to have it in our laws. The closest thing is the specific offense listed below.
but yeah i agree, this dude is toast . add on public intoxication and carrying/PENAL CODE
TITLE 9. OFFENSES AGAINST PUBLIC ORDER AND DECENCY
CHAPTER 42. DISORDERLY CONDUCT AND RELATED OFFENSES
Sec. 42.01. DISORDERLY CONDUCT. (a) A person commits an offense if he intentionally or knowingly:...
(8) displays a firearm or other deadly weapon in a public place in a manner calculated to alarm;