The first one definitely sounds like a hand-over-hand (L.H., R.H, L.H, R.H,etc...) arpeggio and like you said, the second one is probably right hand only. The reason I am hearing it this way is that the first one is very fast, almost too fast for one hand to do consistently well under pressure.
As for fingering, it is possible to do all the notes of an F minor pentatonic in the left hand, then do all those same notes an octave higher with the right hand. For instance,
5-4- 3- 2-1 in the Left Hand and:
1-2- 3- 4-5 in the Right Hand, then alternate smoothly to the top of the piano.
You can also use the same fingering but start the pentatonic on Ab, making it
It takes a little practice hand-position-wise, because you are playing the big pentatonic cluster all at once. But I would use this over playing just one note (Eb) in the left hand, because you might get unwanted accents with that approach. Also, with the pedal down, any non-sounding note errors playing the cluster approach that I described above, you would most likely not catch it because it is so wet (with sustain pedal) and fast.
Nice clip, I'll have to check out the original - thanks for sharing.