I had the pleasure to see Water at the last Balfa Camp last April. He was featured at a "Masters' Presentations" on one afternoon accompanied by U.J. Meaux on the fiddle, who just passed away last Summer. It was great to see Walter Mouton in action. Something impressive is how he handles his below action - with a very precise action, and completely straight sideways (hard to describe, but it's quite unique).
I have that presentation saved on a DVD.
Maz