He stumbled and the wizard caught Draco in his right side with a slashing hex and he cried out and clamped his forearm to the wound, feeling blood trickle down over the stump of his arm. Damnit. He couldn’t afford to lose any more strength. He hit the wizard with his own cutting hex, gashing the other’s wand arm open from wrist to elbow, but the wizard was relentless – he flicked his wand and sent Draco flying back into something hard.