 As the angels go across the top of the stage for the show. But it's the same idea. Like you pull, they move. You pause until you pull again and they move. But yeah, you find it again and again. You talk about people pulling water up from a well steadily by jerks. Often, so steady or steadily by jerks. Both of those constructions are used. And usually with the verb move in front of it. Move steadily by jerks.