I think that Katherine was as surprised that it worked as you were because she didn't walk right in she took it slow. I don't think she thought it would work. I also think that the reason the fire department called Jenna because they are used to having her in town, John has been gone for a while and creeping around town when he was there.
Just reading back through these and Tyler's predicate confusion just made my whole day. Awesomeness, so thanks for that! :D