Yeah it will slice it up more due to it being thrashed around in the body. Even if it is a mechanical it would still cut because its being thrased. It doesnt matter what type of head it is. I think the only problem with the arrow being still inside of the deer is that typically the arrow stops the majority of the blood from escaping the body because the arrow, in essence, is blocking the wound. But either way if you hit the boiler room or not, and whether it thrashes around and cuts that deer up more, either way, its dead.