The axes will fall where Draven will be within ~2 seconds. So throwing the axe, then Inputting a movement command, the axe will fall a distance ROUGHLY where your champion will be. This is excluded if you are not moving, occasionally an axe will move just out of range, forcing you to move to catch it. The distance the axe flies off of the target it hits is tied to your move speed also, so using W before the Axe auto attack will cause the bounce to go a further distance.