It broke about 8 inches down the shaft. In all honesty, I don't know where I hit him. I thought I missed him.. That's the crappy part!
^^This. It's fairly common for the shaft to break when the animal bolts if you hit at or around the shoulder without passthrough. Afterall, you're getting every bit of that animal's jerk reflex into a heavy bone area and shearing into the shaft. The exact same thing with my buddy's Nebraska whitetail. He hit it at 63 yards with no passthrough and the shaft snapped the instant the deer bucked and bolted. The damage was already done, even in that split second and the deer was down in 140 yards.If your arrow impacts tight to the shoulder i don't think it's unusual to break off a shaft when the animal bolts, broadside or quartering away. I've heard aluminum shafts break and have had whitetails break off both sides clean on a standing broadside shot and found only a shaft the width of the chest cavity still inside( no trees involved). A lost animal is a heartbreaker no doubt but don't beat yourself up over it.