So the three screens have an entrance, an exit, and an future observation screen. Some people apparently saw a future through the third screen that was so horrible they tried to dimension jump using the entrance of one of the screens, but it somehow failed and so they got trapped in a 2D space/photograph where they'll be stuck for all eternity, unable to die. Freaky.
And this I suppose is why Hama/Yume saw all those weird things happening, because now time/space is warping in the area. And also why they both got warped/teleported to a different area.
The big question now is that Yume saw her future self growling "Unforgivable" which now foreshadows that something will happen that will make the normally kind Yume snap.
Oh and Q is still doing questionable science things lol.