One of my greatest fears in Japan was that something would happen and I'd need to call for the police or an ambulance. Communicating in a foreign language can sometimes be trying in the best of times depending on the context, the person you're speaking with, and the vocabulary required. Doing so in a situation in which one is in a panic is almost unimaginable. If there is ever a situation in which you won't be able to get your head straight, it's when a loved one is lying unconscious on the floor.
I'm very happy that nothing ever happened which required me to call for emergency services in Japan and I don't miss the fear that occasionally popped into my head at the notion of having to do so.