Too bad these things happen.. Good that you have better monitoring in place. Do you also have a disaster recovery plan and monthly fail over tests?
I was better not to name people. Everyone can make a mistake and off course you can put other people on the job, but why put the name public here. For sure he did not do it on purpose.
RE: Witness Update - Acknowledgement of error and changes to @curie witness operation structure (April 2nd, 2018)