Empty Hands,
I teach Concealed Handgun License classes in the state of Texas. I know well our laws. Carjacking, and someone grabbing you through the window would be considered an attempted carjacking, is subject to deadly force.
9.32. DEADLY FORCE IN DEFENSE OF PERSON
(A) unlawfully and with force entered, or was
attempting to enter unlawfully and with force, the actor's occupied
habitation, vehicle, or place of business or employment.
And you do NOT have to retreat (unlike some states laws.)
Deaf
I am with Deaf here Texas has great laws when it comes to certain things