The Battle of Demons Run: Two Days Later is a mini-episode that served as a sequel to TV: A Good Man Goes to War and a prequel to The Snowmen. It was first released onto the US iTunes Store and Amazon Instant Video in late March 2013, just prior to the launch of the second part of Series 7, which was 20 months after A Good Man Goes To War and 3 months after The Snowmen. It explained how Strax survived an apparently fatal shot from the Battle of Demons Run, and how he ended up living with Madame Vastra and Jenny Flint in 1888 London.In the aftermath of the Battle of Demons Run, a battled-scarred Strax lies dead on the floor — or has he just fainted...Strax is woken up by Madame Vastra and Jenny Flint, and is told that he had not died since they had used alien technology to heal his wounds. Jenny says that he had never truly passed away thanks to the resurrection technology and he had been in a state of unconsciousness for two days while the resurrection device healed him. He's angry about not having died. Vastra and Jenny then announce that the station is being evacuated, and they offer to take Strax with them back to London. Strax is hesitant and at first rudely refuses but then changes his mind and agrees to accompany them.