Jimmy works as a security guard for Able Ltd. One night, whilst guarding Able Ltds premises, Jimmy comes across an intruder. The intruder says that he has accidentally walked on to the premises and offers to leave. Jimmy is convinced that the intruder is the person who stole Able Ltds safe three months ago. Jimmy threatens to attack the intruder with a crowbar if he tries to leave. This frightens the intruder, who runs away. Jimmy rugby tackles the intruder and punches him several times. Jimmy then locks him in a storeroom while the police are summoned. When the police arrive, an hour later, it is established that the intruder had been acting innocently throughout. The intruder has suffered a broken nose and his clothes are ripped. Advise Jimmy of his legal position and whether Able Ltd shall be vicariously liable.