Ah right assuming A and B are opposing candidates. Kind of a way to eliminate the most popular opposing candidates in a runoff assuming there is a middle of the road candidate that everybody likes.
In RCV this might be translated differently tho. Maybe 26% vote C #1, 49% A #1, 25% B #1 with C #2, then in runoff, C would win.
I don’t see everybody liking the same candidate for #2.