The dropout is due to my cutting the audio too short when the transition is made to the Waterfall sequence.
On a tangent, I originally thought this scene had little merit and considered not restoring it. But then I realized it's about as plot-integral as the giant rolling ball at the beginning of Raiders of the Lost Ark. i.e. It's just an added bit of danger, tension and action to an otherwise dull part of the movie. Clip out Jar Jar's nonsense (given the fact he could swim against a waterfall current effortlessly, what was all the panicking for?) and it plays out pretty well.