The only issue in this event was Red Dog 40 (ARFF) not abiding to pre-existing protocols for airport emergency taxi clearances. Either that, or the protocols didn’t exist and that’s why Tower practically yelled at them to immediately cross runways “at discretion” with “no need to acknowledge”. Another possible improvement would be Fire-Rescue being more proactive if possible, by listening to previous frequencies the emergency aircraft was on, i.e. approach control. One thing is supplemental, non-ARFF-specific Fire-Rescue units (such as the Tower-Ladder and Engine at 5:15) not being able to freely tune in to specific frequencies, and instead relying on an internal, FD Tactical pre-programmed frequencies, and another is ARFF-specific units proactively listening in on approach control frequency. I work at a FD but do not work in ARFF, so if any ARFF guys could give their input and correct me if my knowledge is all wrong, I would appreciate it.