`` come along ; you can be of some use for once , '' he said , and at once loaded the boy down with bandages and knives and dragged him over to the poor injured creature , who warily hissed them away until temeraire turned his head and snapped at him ; then , cowed , he hunched down and let keynes do as he liked , only whimpering a little as the surgeon moved the broken spines back into their places .