What makes these details interesting is that, given the nature of the Sith Lord, it seemed unlikely that he would intentionally be removing his mask for any reason in the series, leading fans to hypothesize about whether we could be seeing flashbacks to Anakin Skywalker in the series, which would understandably require Christensen's involvement. The outlet also shared renderings of a bacta tank and a mask resembling the breathing device seen in the concept art that are based on actual photos from the set, which would imply the concept art could have become more than just a concept. The image features a mask-less Vader, and while the image itself is merely a concept, any plans to show Vader in such a state would explain why Christensen's involvement would be necessary.
The concept art shared by the outlet sees the critically injured Vader in a bacta tank, similar to how we saw Luke Skywalker recuperating on Hoth in Star Wars: The Empire Strikes Back.
