There are certain things in Riverview that Alex tries her best not to think of, and of course the biggest one is demons. For good reason, but she's trying to avoid the subject as much as she can. When Harry's describing what the creature did, she can't help but think of it in terms that she knows, and in Alex's quite good mind's eye, the creature was more demonic than man or beast. So she just took a sip of her own scotch for a moment.

The whole thing about it being tied to the Earth and not being there also made sense to her. "Back home where I'm from, there's a lot of stories of hauntings around Native American lands where white people when and screwed something up. I can see how this would be a similar thing, trying to protect Lady Silence and her people from whatever was happening with your exposition. It must have been awful to be there but to not really have a choice in it. I'm sure that the creature didn't even understand that."