> If someone is asking clarifying details it's likely because they are trained to do so, as people in real life emergencies tend to get flustered and make mistakes.
As an anecdote, I was once dispatched to an unconscious elderly female with a head injury after a 10' fall. This is obviously a fairly serious, time critical situation.
We arrived at the dispatched address, and found a man who was seriously confused as to why an ambulance crew was pounding on his door.
Turns out, the call was actually on the opposite end of our response area. The woman had been found on the ground by a delivery driver, and in his excitement, he pulled out his clipboard and mistakenly read the address of his last delivery.
Obviously the call taker would have no way of knowing that, and accurately dispatched us to the address that was reported. It just goes to show how easy it is for someone calling 911 to make a mistake, and how critical it is for call takers to do as much as they can to verify the location of the incident.