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I was djing at this milonga and playing a nice tanda of Calo con Beron. One of the guys who has been dancing for a couple of years asked one of the local teachers to dance. She was a dynamic dancer who has danced and performed with some of the biggest names in Tango. She gracefully accepted the invitation and embraced him. This guy, whom I know, danced decently. He walked with the music and did slow giros. Slowly the teacher closed her eyes...
All of sudden, he decided to open up the embrace and started performing some forever tango stunts, which was clearly beyond his physical capability. Looking at the expression of her stern face, trying to dance to his lead, I shook my head: this guys hadn't figured it out yet. He hadn't found his tango.
A couple of weeks later, at the same milonga I was dancing with a beautiful young woman from out of town. She had a decent embrace, dancing quite nicely. Our cheeks were touched. I was breathing smoothly, and I could hear her breathing. A moment of tranquility...
That lasted only less than two minutes, she went in and out and danced close to open afterward. The whole tanda, except the first two minutes, I had to figure how to dance with her. It was like trying to sleep, but constantly being waken up. I hadn't asked her to dance again, although she was very beautiful young woman.
I have paid attention to how good teachers, dancers and performers dancing socially in the milongas. Most of them don't break the embrace and do the amazing things that they do in the performances. Most of them dance very calmly, one step at a time. The ones who are moving like chicken without a head, showing everything they have learned yet mastered on the floor are the clueless wannabes.
There are nothing, in my opinion, that one wants to express in the music or communicate with partner, that one couldn't do it within the embrace. You could, however, find a lot of things missing in the open embrace.