Biden's debate, factually he slaughtered the felon. But he was stupefied by the felon's brazen lies, and the outrageous things he said. He clearly underestimated and did not prepare for the real felon. Who could? When you deal with a dishonest person, you should expect anything, and not be outraged or stupefied by veracity of their lies.
If I was Biden, I would have jumped all over that, making the biggest deal of it possible. I would have eviscerated the felon.