The shooter might have legal problems. In Texas, as in most other states, it is illegal to carry a concealed weapon into a bar. Here is the relevant Texas Statue:
GC §411.204. NOTICE REQUIRED ON CERTAIN PREMISES
(a) A business that has a permit or license issued under Chapter 25, 28, 32,
69, or 74, Alcoholic Beverage Code, and that derives 51 percent or more of its
income from the sale of alcoholic beverages for on-premises consumption as
determined by the Texas Alcoholic Beverage Commission under Section 104.06,
Alcoholic Beverage Code, shall prominently display at each entrance to the
business premises a sign that complies with the requirements of Subsection (c).
(b) A hospital licensed under Chapter 241, Health and Safety Code, or a nursing
home licensed under Chapter 242, Health and Safety Code, shall prominently
display at each entrance to the hospital or nursing home, as appropriate, a sign
that complies with the requirements of Subsection (c) other than the requirement
that the sign include on its face the number “51”.
(c) The sign required under Subsections (a) and (b) must give notice in
both English and Spanish that it is unlawful for a person licensed under this
subchapter to carry a handgun on the premises.
https://www.dps.texas.gov/internetforms/Forms/CHL-16.pdf
CAUTION: Gun laws vary from state to state and are sometimes confusing. In Florida where I live even if you have a permit you cannot carry a weapon into a place whose primary purpose is serving alcoholic beverages. This means that you can carry into a liquor store since they sell liquor but don't serve it. You can also go into a restaurant and order a drink with your dinner since the primary purpose of the restaurant is to serve food, not alcohol. However, if you go into the bar to have a plain coke you have broken the law.
