In this specific case, prepare fortifications around the temple mana pool to guard against intruders and better defend against assault.

Which I would be fine with if there was a reason given. Or even if we were told there is a reason and that cannot be told to us. That there was not one says that either there is no reason, that the reason will not be communicated to us, or that the reason cannot be communicated to all of us. However you break that down, the end result is that the Storyteller insists we maintain a weakness in our defenses that has already been breached once.