My understanding is Boston Fire is auto-dispatched to unresponsives, chest pains, major traumas... basically anything that sounds like it might be or turn into a cardiac arrest, basically for the purpose of putting CPR-trained personnel and an AED onscene as quickly as possible. They are not ALS-equipped. Anybody who is a paramedic prior to being hired as a Boston firefighter is not authorized to practice as such.
The BEMS BLS truck would of course have had an AED. I mean, duh. Since the call was coded incorrectly (or so it would SEEM from the information at hand), the dispatch was a BLS ambulance, who obviously upgraded the call to ALS once they arrived. Is there a protocol for a BFD response upon discovery of a cardiac arrest with a BEMS unit already onscene? I don't know. Maybe, maybe not.
We don't know this person's medical history, overall physical condition, or down time. A 4.5 minute response for an AED-equipped vehicle is pretty good by any standard, and with CPR in progress prior to THEIR arrival, this guy already had a better shot at survival than 80+% of SCA victims, with or without the heroes of Boston Fire.
And he's still alive, which is better than 90+% of all SCA victims can say. For all of the pontificating that the BFD and their union will throw around about being shut out of a critical call and how this "proves" that BFD should be running Boston's EMS (*cough*intotheground*cough*), just that fact tells me that BEMS doesn't have it as wrong as they'll be made out to.
Or, since you know ALS is enroute, you could focus on CPR, defib, and BLS airway management to give the best possible chance at survival. Stopping CPR to package and carry (could have very easily been on the second or third floor) and then racing off to the hospital with one EMT in the eback would have been putting a bullet in this guy.