once he had obtained itstill being in rapid motionhe glanced up again and calculated quickly the progression of the first eversors motion so that once he had determined where he was going and what particular rate of speed , he set his arrow to the cord of his bow and aimed up another timeno , not where the contender was at that exact moment but where he would soon arriveand only after accomplishing this did he free the arrow to take wing and soar off into the air .