It's quite normal for Andariel to have this reaction. After all, this world doesn't have any means to resist poison gas; generally, everyone relies on their physical bodies to withstand, then uses detoxifying magic or antidote potions to remove the toxins. And Andariel's poison gas is exceptionally domineering and extremely terrifying, and the people of the Sisterhood of the Sightless Eye are mostly women and archers, not like warriors who possess resistance to toxins. This is one of the reasons why the Monastery of the Blind Eye fell swiftly under Andariel's assault.
However, the power armor of Duanmu Huai is designed for cosmic warfare, where perfect external isolation is a prerequisite. Even Andariel's poison gas cannot penetrate Duanmu Huai's defenses!
Not to mention, purely in terms of strength, Duanmu Huai is stronger than Andariel!
"This is—!?"
