Fighting Fire and Water with Fire and Water

Fighting Fire and Water with Fire and Water. The latest episode of The Good Vort, presented by Rabbi Yosef Grossman, OU Director of Kosher Education. Recorded live at a OU World Headquarters in NY, NY on November 24, 2010.

In Hoshanot for Hoshana Rabbah we say the Sar of Esav is made of fire; in Tefilat Geshem on Shemini Atzeret we say the Sar shel Esav is made of fire and water. What is the source for these 2 and how do we resolve the contradiction?