A last resort for a night going wrong: Fall back to the inner room. Both defenders retreat to the bathroom and cover its one doorway (and its small window), shooting only what comes through.
It saves lives, not the house. Zekes roam the rest of the house and wreck your stock of boards, and if nobody is guarding a window or door at dawn, the night ends "You lived, but the house is theirs" instead of "You held the house".
Zekes now go round to the inner room's doorway instead of walking through its walls.