Antioch residents were jolted yesterday when a residential condominium caught fire, thrusting the Contra Costa County Fire Protection District into action. The incident saw firefighters from Engine 82 and Engine 83 responding to the scene after observing smoke from afar. The blaze, which had taken hold of the middle unit in a condominium complex, was already belching heavy smoke and flames upon their arrival, as reported by the Contra Costa County Fire Protection District.