madcat over 10 years ago I dunno if this is kneeling, in which case I'd be tempted to add error, or if it's an amputee, which seems more likely. Is there any info on this from the artist?
Soljashy over 10 years ago I can't access the source – it looks like the artist deleted the image from his Pixiv profile. I'm willing to bet it's an error, though.
Plasmapitch over 10 years ago maybe she's going through the ground? like an invisible ground or something?