[QUOTE="Also, much has been made of the fire chief using his personal vehicle. This is very common. It makes no sense for a 'command officer' to drive to the firehouse to get a marked vehicle and return to the scene if the scene is closer to whatever location he is responding from. [/QUOTE]
Well ... I can only reply based on my training in my state, but, in PA, they can indeed use their POV, but, without the proper lights (and audible signals to be used while responding if outfitted with flashing red lights), they are not emergency vehicles and are not to be used to block traffic, break traffic laws, etc. Responders can also equip vehicles with flashing blue lights but no siren (with authorization and blue is the only color to be used in that case), but, those are only "courtesy" lights, so, they are also not supposed to be used to block traffic, break traffic laws, etc.
If this incident happened in PA (and states with similar laws), I think much would be made about it (if the word got out), it is unlikely that it would be swept under the rug. In PA, the chief would have been dead wrong for 1) Blocking the road with an non-emergency vehicle 2) Committing assault ... and could be prosecuted . And, nowadays, the chances of something like this going public are pretty high. I would guess there are some different laws in OK, but, assuming they are similar, the guy was dead wrong.