Looks like robbery to me:
Under Texas law robbery is theft by force. Often called a ” strong armed robbery. If a person takes another’s possessions by physically grabbing them, pushing them down or hitting them and causes them any type of pain, then the crime is robbery.
http://shookandgunter.com/robbery-vs-aggravated-robbery-texas/
He has been charged with Robbery in accordance with the law
They cannot charge him with anything else as the elements is a crime beyond robbery are not there