I think the thing that convinces me of the EMP theory the most (other than you and your mutuals brilliant theories!) is the plant in CAM's office sliding forward while Sherlock falls backwards. and that's right after he was shot. I think Arwel even replied to a tweet about it (not sure though)
Hi!!! <3 This is the tweet where Arwel was asked about the glowing skull, and bizarrely (because he usually doesn’t give tons away) answered a question with a question (that gave tons away) … (X)
Fan: WHY DOES THE SKULL GLOW?
Arwel Wyn Jones: WHY DID THE VASE SLIDE?
Here’s another thing that I think the sliding plant can tell us… The camera tilts to follow Sherlock as he falls as if Sherlock is staying still and the room is tipping over. So it’s like we, the viewer, are going WITH Sherlock. So the plant sliding tells us that the real world is falling away from us, yet we the audience stay with Sherlock, with his point of view. And because we know he was losing consciousness as he fell, we’ve stayed right there with him in his head.
[Yeah it would have been cooler if everything in the room fell away, like Mary and Magnussen and furniture and junk, but maybe that was too expensive so they stuck with pulling the vase across with a bit of fishing line] [Also now that I’m staring at this gif it reminds me of the tilted room in TLD]