I think Penelope just fell in love with Colin all over again. In this scene, Colin overhears Lady Featherington talking down to Penelope. He then steps in to defend Penelope.

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Colin Puts Lady Featherington in Her Place | Bridgerton | Netflix
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Penelope sets out to marry while hiding her secret life. But as romance and revelations collide, she must choose between her pen and her heart.