What did your arrow look like? You said no blood...but did it have the "saliva" type stuff on it?
Blades were bent due to whatever it hit in the ground (IMO). If you hit the shoulder knuckle, you'd know it. It would sound like a .22 rifle. I'm having trouble picturing this happening on a 5yd shot....and the arrow "deflecting", though.
My guess is you didn't hit where you wanted to (obviously) and you clipped him. Would've been the same end result with any BH.