In Texas in a situation like that the cops would be more likely to be critiquing your marksmanship while the bleeding POS was on the ground than questioning you.
LMAO... it's true. In Florida, after my brother shot a guy who tried to rob his pharmacy, the cops were laughing at what appeared to be blood and possibly feces/some kind of gut content on the sidewalk that the wounded man trailed as he got into the getaway car.
Moosey, I'm sure you know now.. but ideally...
You put the $ directly into your front pocket.
You have your glock up front, either in a fanny or preferably inside waist band front.
You catch eye contact with everyone you can. You watch their hips, eyes, and hands. Eyes lie, hands can give them away, but hips are the telltale sign what they intend to do. Any deviation from standard hip motion and you know this person is someone to watch.
If someone comes at you for money, you raise the left hand, create space in a backwards/angled direction, while drawing your weapon. You are FVCKING LOUD. You give him the loudest "No Motherfvcker!" you can in your sternest cop voice - it might hesitate him for a second, and it'll certainly alert witnesses and heroes alike. You make it very clear to the 8 people now watching that you retreated and issued a warning and tried to defend with your hand, and then you did indeed use deadly force on the guy who was committing a forcible felony on you.
Once he has your cash, nah, you can't shoot him. You can catch him and politely ask for you $ back.