During a recent dinner at the New Horizon Assisted Living Facility in Marlborough, a potential emergency was swiftly handled by a quick-acting college student employee. Brian O’Leary, a 21-year-old Worcester State University senior, was recognized for performing the Heimlich maneuver on an elderly resident who was choking. According to a WHDH report, Phyllis Bagdasarian, 93, was enjoying her pot roast dinner when she began to choke. “He’s polite, he’s kind, and that day he was my hero,” she told WHDH.