An off-duty Border Patrol agent in downtown San Diego, California, stopped and apprehended a knife-wielding suspect who charged a bystander near a restaurant, according to the agency.

At around 7:30 p.m., the agent, who was not identified by authorities, left an eatery with his girlfriend on July 19 and witnessed a man waving a blade while moving toward a group of people, officials announced on Monday. The agent instructed everyone to clear the area, directed his significant other to phone 911, and drew his “personally-owned firearm” on the suspect.