Swanson: ...slide fingers as necessary. For example in the first beat of measure 9 [sic] where there is a, c# and g in the right hand, the second finger will slide from the c# to the b. [sic] In measure 16 the right hand has a c# and a b, the thumb is used for the c# and slides to the b# on the next sixteenth note.
Note: the measure numbers assume the opening partial measure is measure #1.
N: There is a bit of minor confusion here. Counting measures, your first advice pertains to measure 10, not 9. And it is to slide the second finger from c# to b# not b. In measure 16 I happen to use the second finger on c# not the thumb. Personal preference.
This trick of sliding also works nicely in the Chopin etude for thirds.
I first was attracted to Scriabin with Horowitz's 25th Anniversary Carnegie Hall concert recording of 1953 when I was 16 or 17 years old (now 72) analyzing each note and fingering myself and trying to figure out how Horowitz got the damned thing so SMOOTH and effortless sounding. A light piano action can do wonders for your technique.
Topic: Scriabin Opus 42 # 5