There are a lot of issues with that scene as far as the accident/EMT thing goes.... To start with, that's not going to roll just an ambulance, nor will the EMTs operate like that, at all. They're not just going down an elevator shaft, in any circumstance, at least not here.
An accident like that is rolling out cops, because it needs serious investigation, reporting, etc., FD, because they're dealing with the logistics of that, and EMTS to treat people ONCE they're rescued. That is a big, big scene. Also, again, here, 911 doesn't talk like that -- that was both too little and too much information. They don't care often who you are, but they need a fuckload more info on what is going on. That was oddly blase. Nor do they, at least here, want random callers to stay on the line. If you're calling during an ongoing incident like a breakin, they do, because they want to be able to provide the in-transit units with updates. If you're calling for something that's already happened, get off the phone.