It's not unusual. Councils succeed or fail on the strength of the vital relationship between the Chair and the Clerk. If this relationship breaks down, it's a slippery slope. Sometimes it's justified, often less so. Usually the warning signs are there, perhaps only in hindsight, but it can come out of the blue. We all deal differently with challenging situations and, for some, the dramatic explosion is the weapon of choice.
One of my councils lost two clerks last year due to unacceptable behaviour by the Chair and I'm now dealing with the Employment Tribunal. It irks me that the council's reputation will be tarnished and the council tax payers will foot the bill for years to come, whilst the bloke who caused the situation walks out with a big grin on his face and will be free to stand for re-election in a couple of years.
We just have to learn from these experiences and move on.