I wondered about a back end hit after seeing the video. Couldn't see the hit, but with a walking deer at 30 yards, unless you really lead him, your arrow could have hit a rear quarter. That could be why you didn't get a pass through. I will say though, 11 inches of penetration in that area even could have killed that deer. Lots of arteries in that area. The blood to me almost looks like a muscle hit, which would line up with a hit in that area. Just keep after him. I've hit deer in that spot and found them. Keep in mind, this is just speculation. I wasn't there, so your front hit could be right. Just makes me wonder.