I liked that story because it showed the difference between the Dark Eldar and the Craftworlders. The Craftworlders were still amazing warriors, equal to the Dark Eldar in martial skill, but when both groups felt something was a bit odd about the inhabitants of this newly discovered Craftworld, only the Craftworlders bothered placing sentries around the building. Then the sleeping quarters they'd been assigned got attacked in the middle of the night and the Craftworlders were rushing around organising all the Ynnari for the defence, only to find the Dark Eldar's rooms were all empty, beds unslept in.
Because the Dark Eldar had said thank you to their hosts for the sleeping quarters, then snuck out and spent the rest of the night arming themselves to the teeth and waiting for said hosts to begin their "surprise" attack.
Drukhari struck me as the sort of people who if you offered them a bed for the night, they would not only never sleep in it out of distrust, they wouldn't even sleep in the same building because they'd have formed their pillows under the blanket into the shape of a sleeping Eldar and then packed the space underneath with a dozen anti-personnel mines on a pressure trigger. And placed monofilament wire across all the exits at neck height.