As an AI language model, I do not have any information on who Jon is or what the back rooms are. Could you please provide more context or information so I can better understand and answer your question?

If Jon Snow was somehow transported to the Backrooms, it would be a terrifying and dangerous situation for him. The Backrooms is a fictional place that originated from an internet creepypasta and is described as endless maze-like spaces with yellowish walls, stained carpets, and flickering fluorescent lights. It is inhabited by bizarre creatures and entities that lurk around every corner. As a skilled fighter and strategist, Jon Snow may be able to survive for a while in the Backrooms by using his wits and resourcefulness. However, he would need to be constantly on his guard and avoid attracting the attention of the creatures that roam the Backrooms. In the end, it is unlikely that Jon Snow would be able to escape the Backrooms without help or a stroke of luck. The Backrooms is a terrifying and seemingly never-ending labyrinth, and it is unclear if anyone has managed to fully escape its clutches.

Incorporating the Backrooms into the Game of Thrones universe could create an intriguing storyline for fans of the series. Perhaps the Backrooms are a hidden dimension that only those who possess magic or incredible powers could enter. They could be used as a place of banishment or punishment for those who have committed heinous crimes. In this scenario, Jon Snow could end up in the Backrooms if he were wrongly accused of a crime or if he were pursuing a creature or entity that discovered a portal to the Backrooms. Jon Snow's survival skills would come in handy in the Backrooms, as he would need to find a way to escape while being pursued by both the creatures and other banished individuals. The Backrooms could also be home to valuable magical artifacts that could aid Jon Snow in his quest to defeat the White Walkers or other looming threats in the GoT universe. Overall, adding the Backrooms into the GoT universe could create an exciting new dimension to the well-known universe and give fans a unique and thrilling storyline.