Woah there tiger, slow it down a bit. Do you not understand? He is not a normal EMS professional, he is a volunteer! Do you not understand the special, one might even say mystical, status that attaches to the individual? Volunteers are freely giving their time because of the king-size heart they have to save the world; why should they concern themselves with doing things that mere "normal" EMS folks do? The nerve of some people...Yes, sitting around and waiting is exactly what one does between calls.
Or you could inspect and clean your rig and equipment, train, study, work out, watch movies. Stuff normal EMS professionals do between calls.
