A value! It's filmed from an unusual angle so the crowd moving together is visible
This jenka dance pattern is an advancing/turning combo and the crowd is moving forward; not in lines but more as a front.
From a general "floorcraft" perspective" this is amazing. The general look of this is very similar to what we see in good social dancing - either in old clips or in milongas that "feel like" they have flow.
And there are several aspects that challenge the "how to teach floorcraft" orthodoxy.
1) different couples move at different speeds
2) there are no lanes
3) vocabulary is not a problem (i actually find the idea of dancing on a dancefloor that crowded while being locked into this jenka dance pattern somewhat frightening - but looking at how couples navigating this there are obviously tools within that pattern to adjust speed and direction)
4) the "train" pattern where people just follow each other is not happening at all.
So if none of these are actually necessary (useful?) for good floorcraft what is? Especially in the context of me claiming that "tango is a freeform circle dance".
(i also danced a lot of just with my partner - we used to rent a studio and do something like .5 technical stuff, and .5 "just dancing" to work on fluency (and honestly to keep from getting bored and frustrated), and i never found dancing without having a ronda all that satisfying.)
The only thing i can come up with is something like "try not to mess up others dance", but that is too general to be useful. A beginner couple plodding around and being in general a moving obstacle is usually no problem, a great dancer who dances to something in the music only they can hear can be difficult to be around.
I wonder people learning a circle dance first might give people some ideas? - e.g. looking at a relics like the vienna opera ball what the debutantes dance at the opening is not a couples dance but a circle dance. When explaining floorcraft having an emphasis on dance as a social experience where other couples are not opponents/obstacles to freely expressing out dance, but partners in creating the ronda/circle. Maybe we should thing of floorcraft not something neccessay to avoid the negative consequences of being in a crowded spaces, but as a something desirable to gain the positive energy of the ronda. Dancing chacarera in a line is a better experience than dancing it only as a couple. (though strangely enough i don't feel quite the same way about zamba - it is structurally similar, but much more a couples dance). The folk dancers i have seen seemed to tend to create smaller huddles when the dancefloor is to big for the number of people they have, not separating them wider.