[...hmm. That's an interesting reading of that...situation, but one that Page can't find it in herself to disagree with. The store was locked from the inside, and there were no other signs of forced entry, so it stood to reason that the inhabitants were responsible for massacring each other.]

...short of a third party having a key - and being able to close and lock the door behind them - your theories are sound. I wouldn't be surprised if this was just another way the Shimmer was playing with us.

[...]

...I must admit, I'm getting sick of referring to that bloody light as a sentient being, but it's hard not to.