[legion]

That is not something I'd want to be in the middle of. In a perfect world, those people would get themselves fired. In the real world, they end up being your boss.

I'd personally use whatever plausible, non-verifiable excuse you can muster to stay the hell out of the situation. I'd also discreetly warn the target if it is not justified.

A few years ago, I was on loan to another manager when my workload slowed a bit. This other manager tried to lure me to work for him. He flat out told me that he wanted to bring me in to push someone out. I apparently was supposed to learn the job from this person while making them so uncomfortable they would leave. It seemed like a plan that was doomed to failure and I'd be left holding the bag. Now, the person this manager was after was a legitimately poor performer. I decided I'd play the manager and I set up a meeting with her and told her that her boss was after her job and what things she needed to do to improve her performance. This manager was very lazy and didn't want to actually have to fill out the paperwork to fire her, nor did he want to have to try to work with her to improve. After that, my old work "magically" picked up and I could no longer help this other team out.