A tricky chromatic scale with a turn-around at its end ushers in a stormy, impassioned section with cross-over hands. Some players observe the notation to a tee, and avoid these hand-over-hand maneuvers, but I, like many other pianists do the re-arranging in the interests of smoothly trailing a melodic line that starts in the bass and shifts into the treble. (This involves Left Hand over Right, where for me, at least, it’s easier to keep a consistent tremolo in the middle voice PLAYED BY THE RIGHT HAND)
Sorry for the confusion in visualizing this. It’s best to watch the video that goes into detail and fleshes out the choreography.
Measures 19 to 41: