Well obviously I don't know how things work up there. But don't you think that it is kind of useful for the calltaker to find out how the injury occurred? "He's not breathing" could mean a cardiac arrest, or someone overcome with toxic fumes that we are about to drive into. I know that we normally have this sort of information - so I don't know why it wasn't available on that call. Nor why it needed someone to ring back to find out.