I can't remember exactly when this was but I recall a discussion about whether Obito would be able to cut people in half with his Kamui the way that Kakashi can. This led to speculation about whether his kamui swirl appears some distance in front of his eye or if it's actually inside his eye hole.
I'm saying it's the latter and that it's not in Obito's best interest to cut someone in half while they're partly squeezed through his pupil. The image above shows the last remaining bits of Sasuke before he's been completely pulled inside.
There's no greater point to this post beyond that I find Obito's eye-slurping very funny. Perhaps it's a friendly reminder that Obito's sharingan can eat and regurgitate people like a tiny mouth of cosmic horror. Because he's a freak ❤️