But they had been already burnt by the force of the penances of pure-souled Rishis (whom they had killed). Therefore though they tried their utmost, they were all killed by the celestials.
ते पूर्वं तपसा दग्धा मुनिभिर्भावितात्मभिः। यतमानाः परं शक्त्या त्रिदशैर्विनिषूदिताः॥