`` i do not have any notion what you are saying , '' temeraire informed him loudly , in chinese , `` but you need n't complain of us , when you attack people out of nowhere-if you should- '' but as abruptly as he had emerged before , the sui-riu was gone : in one smooth motion he plunged beneath the dark murky waters of the bay , clouded even further now by silt and sand raised in their exchange .