tl;dr:
>Maid Ane prepares to act the part of the Crimson Scholar. The plan is for the Winter King to deliver her into the custody of the messenger sent by the Central church who claim Maou to be a heretic. As she is paraded out, placed in stocks and whipped, Yuusha is poised to save her, but she deviates from the set plan and delivers a speech to the masses assembled before her, drawing from what she’s learned from the Chief Maid about not being equivalent to an insect in value. She moves the crowd to turn against the messenger, and even inspires the Winter King to place her under his protection, and orders the Centrals to skedaddle.
>When the chief maid called Ane and her sister insects, it was cruel, but it was also true. Though they were serfs – two of seven siblings, the rest of whom were raped and killed or died of disease – they were also humans, and had the ability to choose their fate. They could choose to fall in line and obey whatever master or noble or priest came along, or they could choose to become better than they were. Ane and her sister gained the awareness of that choice and made themselves better. And now the serf, who was so close to death when she first met Maou, has found her voice, and as Yuusha puts it, her words have the power to cause entire armies to withdraw.
>Maid Ane’s speech leads to the Winter King abolishing serfdom across every province in a bid to attract people to settle in the Southern Nations, enlisting bards to spread word of the advantages while also spreading Humanist anti-slavery literature made on the newly invented printing press.
tl;dr of tl;dr The Church expects to make an easy example to all heretics out of a weak limp-wristed meido, gets totally BTFO