The process of asking open questions (as opposed to fact-finding investigative questions or "let me share what I think you should do" discussions) often leads to the insight on the part of the manager that there is a genuine gap between themselves and this particular person. The manager can give plenty of examples of behavioral or performance issues. But when the questions are about how they work together, how well the manager knows the person and his or her challenges, what other work related things they talk about ... the manager often gets quite silent. He realizes that all they do with this direct report is work, talk about work and complain about the work that doesn't go well. They realize there is not really a "foundation" to their working relationship. There is only work and that's all they talk about. And that's (maybe ...) OK as long as things are going well.
But when they don't, the lack of genuine relationship, the lack of trust or mutual respect makes it very difficult to get out of the negative spiral. Without a solid personal foundation based on other things than "work" (which can cover KPI, job role and responsibilities. payment, benefits), difficult situation often turn sour.
As someone in a recent session shared at the end, "I realize that I need to start working on trust and respect right from day one, not when something starts to go wrong."