…
She set a tone at the very start when she walked right into his space to shake his hand and made him almost pull back into himself in response. She was in charge and never stopped being in charge.
Harris also managed what neither Joe Biden nor Hillary Clinton nor any of the 2016 Republicans managed to do which is successfully bait Donald Trump and get under his skin. Within a few minutes Trump was visibly angry and not in a way that empowered him but in a way that made him lose focus, go down rabbit holes and generally go off onto damaging tangents. Spittle anger, not righteous anger, shall we say.
Unrelated outside of the title… Pokemon Go to the Polls was a very fun bonus episode for dungeons and daddies
Related, I really hope the Taylor Swift fans register and vote (and more, but her fans are relevant right now considering the endorsement right after the debate)