Well, thanks to Errata being a braver soul than I, we can see chloroform -might- account for the utter silence and lack of signs of struggle. Which is eerie, when you think about it, the proximity of people to those locations.
MacGuffin, I tend to think very much the same way. Blitz attack, victim well and truly subdued and prone before the throat is cut. If they'd been standing or even leaning forward against a wall (for the skirt lifting stuff) there'd be blood absolutely everywhere.
Errata, did you get redness around your mouth, at all?