When a Mid-City martial arts instructor was approached Wednesday about lessons outside her studio, she didn’t expect she’d have to demonstrate her skills, but the prospective student turned out to be a thief. Surveillance outside of the 36 Chambers martial arts studio shows Meredith Livengood pull out her phone to show a young man training schedules, but moments later the young man snatched the phone from her hand and attempted to escape on his bike.