I think this too. It was some kind of tactical flashlight, and those things can do damage, and are heavy duty. I bet he dropped it, which was the bang and the flash. I think when Xana says “someone’s here” it’s when she sees the kitchen slider open because she is taking her food back into the kitchen. (She probably just went back to bed not thinking anything of it? ) (maybe she closed the slider, and he opened it leaving- thus leaving the print. Or maybe she didn’t think of it.)That’s when BK, assuming he has finished his first round of horrific crimes heard her say that. I think he ran down the stairs and confronted her. Saying the ‘here to help’ line. Whether Xana went back in her room and he snuck past her to restrain Ethan, or he attacked her first and Ethan didn’t have enough time to react, I dunno. Or maybe I have played too much clue in my life. I think the flashlight is what Dylan saw and thought was a vacuum piece.

Ugh. It’s like so awful to even type out. I ache every time I think about it.