A robot dog is refusing to leave the stage at London’s Southbank Centre. It strains against its leash as its owner, dressed in all black with a cyborgian, voice-changing mask, tries to drag it backstage. This is easier said than done, because the robot dog is bred for fighting.What we’re describing here is not the opening of a dystopian sci-fi film, or a scene from a new season of Blackhellip;read more raquo;nbsp;nbsp;nbsp;nbsp;nbsp;nbsp;View Gallery (13 images)nbsp;