Amy Bishop was crouched behind a parked car, gripping a pump-action shotgun with one shell in the chamber and another in her pocket. Workers at a nearby business were yelling, “There’s a girl with a gun!’’ and running away. A police officer approached cautiously, holding his pistol behind his leg as he tried to reason with the wild-eyed 21-year-old. But Bishop would not budge. “Miss Bishop seemed frightened, disoriented, and confused, but she kept both her hands on the shotgun at all times,’’ the officer wrote in a police report. “She wouldn’t drop the gun.’’ It wasn’t until another officer...