It's a fascinating common phenomenon like when someone feels they are done with what they wanted to say they go fluent and can say what ever at the end of the sentence like "yeah that's what I meant." The mind is a very powerful thing. This shows the potential we have. One fallback I had was when I felt a stutter I'd backtrack and try to ...how to put this..like go blank and not even think about "what word" I wanted to say. Like drop the intent like as if I am silently saying "blaaah" or "argh" rather than lean into it. So silently I go back a few words like I dropped the attempt entirely and as I go again it feels like walking where I don't need to think intently and worry about the word, it will just come out and morph into or feel like any other word. Basically I am trying to get out of my own head the way one would feel after they are done or when they talk non-challant (sp?) feeling like they have nothing important to say. Can remind yourself you have time, nothing important hinges on what you are saying and change how you feel about it.