I did not hire them thinking they would leave! I hired them, and they accepted, knowing the risk involved. When they left, I lost a good resource, and they lost the appropriate benefits. But in each case, both of us knew the issues and risks up front. In each case, the reasons I lost the people that I did, were not related to the original reasons why they agreed to come to work with me. Life changes, and so do priorities. Oh well.
As you say, Brohm could have an emotional moment and leave. Or there could be any number of other reasons why he might want to return to UL - family health, etc. Reasons that he or MBob could never have anticipated in advance.
But in the case of Brohm eventually wanting the UL position, I maintain that if MBob did not discuss that with him, then he was not doing his job. That is an obvious topic of discussion when the prospective coach has such endearing ties to a community and his alma mater.