Lord Narasimha after killing Hiranya drank blood. He could not control. As usual all went to Siva and requested him to control Narasimha. Siva and Narasimha had gruelling fight and at last Narasimha fell on the ground with folded hands in front of siva. Any puranic reference for this. Shiva puranam says about Shiva's bravery.Vishu puranam speaks about Vishnu's bravery. As Narsimha cannot be overthrown by anybody bcoz he is the supreme God. Narasimha [Vishnu] is the creator, preserver and destroyer. After Vishnu it is Brahma and then only Shiva.