The girl has a strong effect on the cluster of houses. She shouts about the death of her pig, and about the party waiting on the road nearby. Sofia is able to hear something else - apparently, the pig's principle value was that it was able to sniff out truffles.
The rest is predictable. The hamlet rouses itself, the men shouting for justice, and some twenty men arm themselves with pitchforks and start towards the road and the party, and the girl among them. Sofia is quite able to outrun them - and the men of the hamlet are not running, but walking with purpose. They do not seem angry so much as determined and resolute.