I'm at a bashing my head on a brick wall moment. Do I really need to explain this? The audience clapped an unexpected (to them) move. It looked good, it was designed to look good. They are an established dancing show couple, it's expected. See their history, there's plenty written about them. But like much in tango, it was an illusion, it was entertainment. I've no idea actually whether the Dinzel's are teaching this active participation in the context of show tango or social tango. I'm actually going to guess at least showy tango as the evidence now is that they don't attend milongas. It makes their opinion and teaching unimportant to me and rather academic especially as it is the teaching world they seem to aiming at.