Someone apperently never watched Dragonball...
In some (or probably many) of the anime intended for a younger audience, everyone falling down (or rather being down from one moment to the next, without any actual falling being visible) seems to be the equivalent to a facepalm.
@True_Darius Nuh uh, they still good.
Wait.. She's a Dark Eldar, don't they draw sustenance from pain as well?
Is she saying she wants to literally grab someone/thing to nom, or does she want to torture something/one?
Quick note about the last panel. The phrase would usually be along the lines of "Shall we go get something to eat?" Alternatively you could try "Shall we get some food?" or "Shall we find something to eat?"
From what I gathered about Dark Eldar fluff, they don't draw sustanance any sustanance from pain and/or souls.
Slaanesh is constantly sucking their souls out bit by bit, so they consume other souls to make sure that the little bits that Slaanesh gets, are bits that actually belonged to someone else.
Or put otherwise, the consumed souls act as a shield, so the DE soul is kept save.
Pain and suffering just make the souls they consume "tastier" and/or easier to rip out of the victims body.