Well, I'm Walter the Long-Winded Wizard. So, my "attack" is actually a form of defense, you see.
My diatribe leaves you unable to take action because you yourself are unable to talk. Ingenious, huh? I really annoyed Satan when we first met, but he said he had a job for me. So, here I am!
If you were capable of speech, then you might merely say that you had an appointment, or failing that, you could at least excuse yourself and make a break for the bathroom. Then, I would be powerless.
What? You're going to walk away? How rude! How can I be expected to defeat such a pugnacious, pug-nosed individual. If I ever have the misfortune to see you again.... Wait, come back.