Could someone explain why this is apparently the fabulous 'stumping of Richard Dawkins'?

http://www.youtube.com/watch?v=zaKryi3605g

He responds by pointing out the mis-interpretation of evolution and the question including this misinterpretation. Why do people just focus on his hesitation and then not listen to the rest..? Is there someone out there that can point to something that I am missing?

I am not asking to debate the content within, but merely how/why this is interpreted as a 'stumping'?
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