Story here. The good guy saw another person waving a gun and shouting threats after pistol-whipping another person in his rage. The good guy, Lloyd Muldrow, subdued and disarmed the offender and held him for police. Muldrow had a handgun, with a Virginia but not a Maryland permit to carry, and police arrested him.
(The article says he was arrested for carrying within 100 feet of a public building. Bruen specifically says that while “sensitive place” limitations may be constitutional, they must be strictly limited and find an analogy in restrictions that were in place at the time of the