Thanks for saying so.
I know this will be followed by a BIG "but" :)
But I didn't see anything 'shaky and lacking composure' in his demeanor at all, and nothing even slightly embarrassing.
Common...you know you are being extremely gracious.
Or perhaps you missed him stammering and searching vainly for a coherent response to the idiot who asked him if he thought he made ANY mistakes.
He ended up coming up with nothing...which was great. I'm glad he came up with NOTHING. But I think he could have done it better.
But not any other time.
You're acting as though it was a pervasive problem, and I strongly disagree.
In an hour it happened once that I saw. It was not the problem you're making it out to be.