Burning in rage, Drona wanted to take revenge from Drupad. While at Hastinapur, he came across the Kuru princes at play, and was able to use his abilities to help the princes solve some of their problems. He used grass to take out the ball from which they were playing. Amazed, the princes went to their grand uncle Bhishma. Bhishma instantly realized that this was Drona, and asked him to become the Guru of the Kuru princes, training them in advanced military arts.