 Armitage performs his own stunts . When performing fight scenes , they would be choreographed carefully so Armitage could take part rather than a stunt double . For series eight , Armitage performed a fight scene in a swimming pool , which he thought was " fun , " but also thought it was difficult as it was " like acting and punching in slow motion . " In another sequence , he injured a stuntman with a hospital trolley . He was only given a short lesson on how to handle firearms , since he was already accustomed to using them whilst working on Ultimate Force . While discussing the shootout at the end of series seven , Armitage noted that he is " not a violent person but when you put a gun in somebody 's hands [ ... ] it 's like a little animal comes out of you that wants to fire the gun again . " 
