Well, as I've said before, I don't have any reason to doubt that this was a reflex action. Reflexes are not the predictable, one-type-fits-all kinda thing that people in this discussion seem to think they are. Literally one minute ago I picked up a measuring cup to put it in the dishwasher, and somehow ended up flipping it up into the air, spraying waffle batter all over my kitchen, then batted it into the sink. None of this was really voluntary, but it would've looked weird as hell.
Anyway, Wideman's story is simply that putting your arms up is a natural reaction to running into something unexpectedly, and I have zero reason to doubt that. I don't think there's any credence to arguments based on that motion having to be intentional, because I've done similar things when running into people in the past. If you're running into someone and you truly don't notice until the last second, it doesn't matter if it's an opposing player, a referee, a poor, starving orphan or an angry Andre the Giant, your reaction is involuntary and won't change.