Samson called to Yahweh, and said, Lord Yahweh, remember me, Please, and strengthen me, Please, only this once, God, that I may be at once avenged of the Philistines for my two eyes.
If Samson had survived, he would have still been a slave of the Philistines, grinding at the mill, led around by the hand, the laughing-stock of his enemies.  The mercy of God granted deliverance from the continuation of that fate to Samson.