[Caitlyn is taken aback by the rashness with which the man vaults through the window. Not even checking whether there's any sort of monster waiting on the other side!]

No, I don't suspect wooden boards would be very effective at keeping water out. [Which only makes her more concerned that the boards' true purpose was to keep something in.

She steps through the window frame, cautious not to snare her clothes on the broken glass, and peers through the dim light, rifle ready to snap into firing position at a moment's notice.]

I think we're meant to head for the basement.