Or: how to silence a persistent interjector, yet maintain your dignity and hers.
Here's how - check with the audience. It's so simple and easy it's almost funny. Let's take a specific example.
Here's a trick that works brilliantly if you suffer from strong symptoms of nervousness. Yes, 'trick' because you're going to deceive your own brain and body into associating public speaking with pleasure. All it takes is a few minutes of quiet practice before you go in front of your audience.