He tried to increase the tension, but the line had been taut up to the very edge of the breaking point since he had hooked the fish and he felt the harshness as he leaned back to pull and knew he could put no more strain on it. I must not jerk it ever, he thought. Each jerk widens the cut the hook makes and then when he does jump he might throw it. Anyway I feel better with the sun and for once I do not have to look into it.