As it was explained before I got here, there is a call taker, an EMD, and then the dispatcher.
Call taker (depending on area), is a PD/SO employee, who asks, 911, what is your emergency. After telling him/her that you "need da bambulaance", they forward the call to the EMD. The EMD then collects info, location, nature of emergency, and makes the determination (at least in Jersey) if it is an ALS, or BLS call. If it is hopping, and a BLS call of low priority, they will then give pre arrival instructions, (put pets away, go outside to flag down), and hang up. If it is an ALS call of high priority, then the EMD will be collecting info, and forwarding it to the Dispatcher on the fly. That is often the reason we, as street crews will not be getting the whole picture. In small cities and towns, often there will be just on person for all three services, but don't get me started in regionalization of emergency services...
If my partner is on the phone while I am responding, he better be getting directions, or getting me a date for that night!
He needs to be working the siren, horn, and assisting me in clearing the intersection.
As for spiking the bag, if the previous shift didnt do it, shouldn't you find that in the AM check?