Ok so after revwatching the interaction of the coaches being tossed, here’s my take:
The referee who initially warned both coaches was pushed aside from the head official after 30 seconds. The head official issued the first techs, with the original ref nodding his head in agreement (ps he never took his whistle out of his mouth). Once Hurley made a move to shake hands, the original ref stepped in and T’d both coaches again.
It seems that the original ref was dead set on getting this thing handled his way. Not sure what was said that got him so pissed off, but he was ready to toss them from the get go