The Upanishad eulogizes Lord Shiva as the second Lord of the world (the first being at Maha Vishnu) who incarnates as Sharabha - a human-lion-bird version, to confront the human-lion Narasimha avatar of Vishnu, when Narasimha becomes destructive. But even he fails and the only one that stopped narasimha was prahalada with love and affection.