Overview
Fencing Lessons is a secondary quest in The Witcher 3: Wild Hunt, set in Novigrad and at the Seven Cats Inn just outside it. It only appears if Geralt won both duels against Rosa var Attre during Broken Flowers. The first part fails if not done before The Isle of Mists.
The rematch
At the var Attre villa, the guard captain says Rosa is waiting on the Temple Bridge. There she gets rid of her escort and challenges Geralt to another duel. Whoever wins, Rosa tricks Geralt into looking away and runs off.
Trouble at the inn
Her footprints lead toward the Seven Cats Inn, where two drunks are harassing her because she is Nilfgaardian. Geralt can charm them with Axii, pay them off, or fight them. Afterwards he and Rosa talk about what should happen to the drunks and part ways.