When the ghost's eye moves in certain ways, the [url=https://i.gyazo.com/eddbffdd0f301bbd0ce2c7ddda6790af.jpg]back [/url]of the eye bleeds through the shell because there isn't enough room.
Edit: Here is a [url=https://i.gyazo.com/51318d7f4cad71696cc1f7100e144dc3.mp4]video[/url]
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Do you have a video of this happening as, from what I can gather from the image, nothing seems wrong and is part of the design of the shell.