True...if they called an ambulance...which won't come unless she has already broken her water and the baby is waving at it's mother. Point being you don't know what the person behind you's state of mind is. Whether they are just speeding, late for work, have 10 minutes to see their father before he dies and their flight was delayed...whatever.
Depends on where you live I guess. Here an ambulance will respond to a hang nail.