Okay, so let’s, for a moment, shift our focus from the barefooted Vision, Wanda in bed, touching each other’s faces with soft looks in their eyes moment. Just for a bit, then we can go back to it.
It’s already been pointed out that (see horrifying image above) this is likely the moment where Vision is hoisted into the air (presumably by Wanda) and that saves him. I 100% agree with that theory. But I realized a potential plot point coming from this.
Not too long ago there were descriptions for Lego sets released (http://those-celestial-bodies.tumblr.com/post/167644433434/infinity-war-lego-set-descriptions). In the Wakanda Lego set it has this as part of the description: Help Shuri to remove the stone of infinity controlling the mind from the head of Vision. Can you do this before the thresher crushes the wall and destroys the diagnostic setup?
This could just be for the Lego set or, what if this hit from Corvus Glaive doesn’t get the Mindstone, but damages it instead? In the comics Corvus’ glaive can slice anything, even down to the atomic level. This means it can probably do some damage to the Mindstone. What if the damage is so extensive it starts to impact Vision’s functioning and the only way to save him is to separate him from the Mindstone? In Civil War he tells Wanda one day he hopes to control it, which could mean, among many other things, the ability to function separately from it. Based on the trailer it really feels like Wakanda is the final battle of the movie. Everyone is there (even Rhodes is flying in the background of that shot with Captain et al running) and so I would assume Wanda and Vision are there as well. Neither of them are in the big group shot of running towards the hoard of aliens. Perhaps they are tucked away trying to get the stone out. Wanda wouldn’t leave Vision at this point. That would set up a quiet tension in their scenes to juxtapose the hell outside. Can they get the Mindstone out 1. without killing Vision and 2. without destroying the stone? If anyone is going to have the capabilities to do this, especially with Vision’s extensive integration of vibranium, it would be Wakanda. Perhaps the intent is to fix the stone and give it back?
This could also be soooooo far off it’s laughable. But there’s my first theory to throw into the mix.
And now I return you to the real freak-out moment of the trailer: