I've heard of this happening every year here in the midwest. I'm still not really sure why it happens, but its always out at the end of the head. I just think these deer can hear the engine and move to what they think is a safe distance, but the size of the heads these days, the deer can be 20 foot from the combine and still get caught in the head. The deer will usually only run 6-8 rows away from danger in a corn field because you can't see that far in. It sure is a shame that a deer that size gets caught in the corn head, but I'll be honest I've never seen pictures of small deer caught in a corn head. Its almost always bigger deer for whatever reason (maybe the small deer aren't press worthy).