Security guards are often the first line of defense when something goes wrong. A recent incident in Chennai, India, demonstrates just how important professional security personnel can be in identifying suspicious activity, alerting others, and helping prevent a potentially costly crime.

In the bustling cafeteria of The Bennet Academy in Manchester, Connecticut, dozens of students fill their lunch trays, friendships buzz, and daily school life hums along. But over the last 18 months, what seemed like a routine lunchtime turned into a series of life-or-death moments — and the person who answered wasn’t a nurse, but a security guard.