Teenager robs couple, shoots himself in the ass with gun he stole from them
This account suggests that he stole the woman’s purse, and that the gun was in said purse. As the man ran after him, the teen was probably rifling through the purse to grab whatever he could before ditching it.
Since the gun was presumably not in a holster, he shot himself. I’m going to go out on a limb and say that because 1) it’s not mentioned in any of the three local news accounts and 2) the neighborhood this was in, that the woman did not have a carry permit.