Guys,
any recommendation on the answer of this question from Lehmann

Qs. Your project team is on its way to finish work on the project, while you have the impression that a staff member is already negotiating the next assignment in another project. You are afraid that the person may come under pressure to start working on the other job before she has finished her work for your project. Her task is very complex, and it would be hard for someone else to take up the partial results and finish them. What action is most likely to resolve the situation?