How do you continue dancing when the line of dance is completely static?

A milonguera who we'll just call Laura told us recently that the giro was invented when dance floors became very crowded.

So how do you continue dancing when the line of dance is completely static? Look here. & listen, too. Beautiful music.

Thanks to Jantango. To be watched many times with great pleasure, and especially before the next Tango al Fresco.