This didn't happen in my hall, but I worked with the elder involved.
There was this newly baptised sister who was married to an unbeliever. She began to confide in an elder in the hall about her martial problems.
Guess what? They began an affair. The unbelieving husband found out about it and told the elders and the elder's wife.
He then came to the hall on sunday and punched out the elder. The punk ass elder didn't hit him back and basically was left in heap in the back of the hall before the other brothers could contain the brusier.
The elders wife accepted him back, but the unbeliever divoriced his wife.
No one was DFed only privately reproved.
The sister's children were extremely scarred by these events and are now outspoken against the religion.