How would you interpret these two sentences?
Twelve people living in this household now, and only one bathroom. Miss Reed calls it The Dance of the Hours. The four Americans always stay up late—the strange, funny Miss Reed (who dresses like a boy) and her husband sleep in one of the guard-house rooms but rarely retire to it until dawn, the same time Lev rises for his morning exercise. Joe and Reba still have their apartment, and take field trips to its bathroom. For everyone else the clock is ruled by quick dashes and rationed cups of coffee. Lorenzo and the other three guards have been known to piss over the side of the roof, declaring that the GPU must be defeated by every known weapon. But some weapons they hold in reserve. The competition of morning is not for the weak-hearted.
How would you interpret these two sentences: ‘…declaring that the GPU must be defeated by every known weapon. But some weapons they hold in reserve’?
PS: It’s from The Lacuna by Kingsolver.