[ npc students are very good at pretending not to see things, and that's what they're going to do here.
There's at least the paper that lets him know where she is, a little hesitation before stepping into the elevator because what it if starts and it passes through her? She's not a floaty ghost, so it should be fine... The paper lowers a couple of inches above the ground in one of the back corners, Haruka making herself small so there's no chance of her bumping into buttons and Sidney won't bump into her if the elevator shakes. ]
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There's at least the paper that lets him know where she is, a little hesitation before stepping into the elevator because what it if starts and it passes through her? She's not a floaty ghost, so it should be fine... The paper lowers a couple of inches above the ground in one of the back corners, Haruka making herself small so there's no chance of her bumping into buttons and Sidney won't bump into her if the elevator shakes. ]