When a character or player goes out of bounds, magical glass is created as a failsafe, as seen in the images of the original post so it doesn't look AS dumb. It exists across both games.
From what I can tell it appears anywhere just in case there’s any out of bounds bugs for any npc, it’s just undyne is one of the only cases of an npc following you in undertale
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Wing Gaster
Because the glass
Is the
Idk tho
bro....