It happened to me once. I put an arrow to high. I think it was between the lungs and the spine and didn't hit any major vessels or anything like that. The deer just ran off, my mouth dropped, and there was not much blood on the arrow even. I searched all over and never found it. Not much blood, it was probably inside though, and that could be where it was, if and when it died. I'm hoping it lived, but I don't know.
You've got such good video of it, maybe a deer anatomy professor type could figure out what else was possibly hit. I'm going to ask somebody here about the liver. Don't some people get parts of their liver taken out and they live? I know we need the liver, but do we need the whole thing?
Its great you posted the video, its great material.
I'm hesitant on using expandables, just one more thing that can go wrong. I got some a few years ago, but I haven't used them and don't really plan on it. I'm a sucker for a bargain and they were on sale. Plus, I sharpen my blades just about every chance I get, so they cut on impact and all the way through or in, whatever happens.