Until I saw the part about that he was "heading for turn 6", I'd envisioned the deer simply standing on the track *in* 6, which would definitely do the trick as that one's blind and there's certainly not enough room to avoid a deer (or car) that suddenly enters your line of sight as you crest the hill.
I'm guessing it must've crossed just past the bridge, otherwise he likely would've seen it as he exited 5.
Sounds like they've got a good handle on him at the hospital, and it's probably fortunate that he likely won't remember what happened. That kind of thing would make it awfully tough to get back on the horse.
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