During the events of Chapter 3 in the "The Twice-Born Warlord" quest, you have the option for

Amiri to infiltrate Armagh's camp and try to defeat him in a duel.

In order to do so, you have to stealth your way through and past

a patrolling Defaced Sister.

However, during the duel

when you're close to winning the duel, the Defaced Sister interferes and paralyzes Amiri in a cutscene, after which Armagh goes after her in a rage for disrupting the sanctity of a formal duel, and in the subsequent battle, he eventually escapes.

Is there a way to take out that person before the duel starts and avoid this outcome?