From Law wiki, the wiki for law research

This rule, in jurisdictions which accept it, states that people who are employed as rescuers in a professional capacity -- fireman, coastguards, etc., -- have no action in Negligence against people who create the danger they seek to alleviate. There is no fireman's rule in English law: a fireman who is injured while rescuing a person from a fire that was caused negligently can sue the person who caused the fire.