It wasn't meant to showcase any sort of technique honestly. I don't recommend techniques. I guess there are some fall backs that may make things easier like a little breath out with sound to start off to stop from blocking on one moment but ultimately I think mindset matters most. Don't dwell on it, you're awesome, what ever happens happens, you can still smile, and you can go on like it never happened or it's not a thing. Let your feelings shine through, once it's done it's done. You can move on without a care for the stutter.