Runk has established the trend for himself to use the names of historical scientists as an exclamation, in a sort of Doc Brown from Back to the Future (1985) kind of way, and here he references two: First is Paschal Beverly Randolph, a 19th-century doctor and spiritualist (among other things), and the second is Benjamin Banneker, an 18th-century astronomer and mathematician (among other things).
Flash learns a new ability, to "ride the lightning."