This is the Fan-film you are looking for https://youtu.be/owrmLeX20CY
Yup 😔 my bad. It was a split second splicing of the forces of darkness added to one of the official trailers. Don’t normally get duped by fan trailers. Sorry guys. On the bright side I still think a Kylo vs Vader moment similar to the Dagobah cave in ESB would be a neat addition to TLJ or ROS.