The knock end of the arrow was still sticking out the near side and broke off when it caught on brush or something. That is how it broke off so close to the end.

As for the deer, it is dead with such a hit as described, you just have to find it. Btw,next time you should wait at lease 9 hrs when you suspect a hit in the stomach/intestines area. There is a good chance the deer was still alive and hemoved further when he heard/saw/smelled you.