ORIGINAL: RobinAim Low
If you don't know where you hit him, why in the world would you start tracking him in the dark? Shoulda waited till morning, that is a for sure no doubter.
Hopefully, what felt like 200 yards really wasn't. If so, good chance you will find him in the morning. If you really went 200 yards and he hadn't laid down, I am guessing muscle wound.
That's what I was thinking as well.