“Swing” was a dance that grew up on the more open dance floors of Los Angeles and Southern California when the swing craze hit in the mid-1930s. It was a dance that came from a loose, casual Ballroom position.
This dance was invented by teenagers, for teenagers, in integrated high schools where White, Black, Asian, and Latinx kids watched each other dance. There were very few rules, and dancers would steal, adapt, or invent whatever steps they wanted.
Out of the casual ballroom dance hold, though, some common mechanics arose: Twisting (like what we see in the move Lolly Kicks), turning partners from that twist (like what we see in the move Toss-Outs), and stretching away from partners to the swing of the music (like what we see in Out & In movements).