Normally, if it's that much of an emergency, you're knocked out anyways, rather than wait for a spinal block.

With my first, I couldn't be moved, with the second, they said the baby was in distress but they still pushed for me to get the spinal and be awake because general anesthesia can depress breathing and stuff in the newborn. They had a good point, but if I had to do it over, I'd be knocked out instead.