Ratnaprabha is a brilliant storyteller. Here, he shares the Alavaka Sutta where an troll tries to trick the Buddha with a series of spiritual questions, which the Buddha answers with calmness and clarity, converting the troll to become a Dharmapala, a protector of the Dharma. 

From the full talk entitled The Story Hatthaka given at Stockholm Buddhist Centre, 2007, as part of a two-part series with the companion talk: ...