You need to get control of the discussion. You need to be assertive and interrupt them. But how do you do this in a polite and dignified way?
In what follows I’ll suggest a few ways you can go about interrupting someone without being rude or damaging the stakeholder relationship.
In many cases, especially with new stakeholders, I do feel that waiting for a lull, no matter how brief, is appropriate. And in that lull, you can ask a question to redirect the conversation.
One of my favorites is