so in theory the [ahem] "real world" should cause me to 1) turtle even more out of self-preservation instinct or 2) revert more to my upright training? I'm confused. (Or can I have cake and eat it, too?)
Think about shooting a match where there were tennis ball launchers next to the targets, pointed at you. Ask yourself if your technique would look any different while trying to dodge those incoming tennis balls. Obviously the goal with training is to make you better and to shoot true regardless of incoming fire, but IME people tend to have a reaction to such things and try to get themselves as low as possible.