Why?  So he's in the room.  He's been ignoring the crow all this time.  By the time he notices, maybe we'll have to fight him for a couple of rounds just to buy time - not with a hope of defeating him.  And who knows, maybe closing the pool is quicker than opening it.  Maybe it just takes covering it up, or throwing in something to make a splash.  I have no idea, but we're in enough peril - which is a fine thing - without closing off possibilities.<br/><br/>I'm very open to any other ideas, but this still looks like the best chance of escaping with everyone alive, by quite a big margin.  So Bree sees it, and I agree with her.<br/>