If it was indeed 6" of penetration you should have a dead deer. 3" and the deer will live. I've been there and done that. Any way to tell from the video the amount of penetration? The reason I ask is because sometimes, due to the circumstances, blood will travel further up the shaft than the actual penetration. Good move to wait until morning. You'll be able to see what you are doing much better. Typical muscle hits start bleeding after about 30 yards. Then they bleed like crazy for 50 - 80 yards, making you think nothing can survive that, Then suddenly..... nothing. He licks his wounds and clots up and he's gone.

I hope you find him, good luck!