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If you look carefully at what the presenter was try to do, you will see that he panicked.
He was in the browser on the Bing search page. He tried to scroll up. You can't do that when you are at the top.
Then he tried to scroll down. There is no "down" when you haven't entered a search term on the Bing page.
I couldn't see what he was trying to do during the other "error" but I'm thinking it might be user error again.