Don't know too much about turning it around, but in case of an emergency the EMTs or medics will simply remove the child IN the carseat. They're not going to take the kid out if there's been an accident. Just as the carseat protects the spine during an accident, it can be used to protect the spine afterward, rather than removing the child from the seat and putting them on a pediatric backboard. They'll cut the seatbelt or LATCH straps and tether and remove the seat with the child in it, tape their head down so they can't move it forward, apply a c collar, and they're gone. Maybe if the baby was choking or something and 911 was called for that reason, but if that was the case mom would have pulled over, gotten her phone, call them, and no doubt by the time EMS got there the child would be out already.
Wendy