[uzerfcwn]

The dataset Github page https://github.com/simonalexanderson/MotoricaDanceDataset does mention some missing finger data:

> Session 2: Casual dancing ... No finger motion.

> Session 3: Vintage jazz dancing ... Fingers captured with Manus gloves, which unfortunately suffered in quality due to sensor drift during rapid motion.

> Session 4: Street dancing ... Simplified finger motion (markers on thumb, index finger, and pinky according to the OptiTrack layout).

The first video in the article does have a bit of finger motion, so I'm guessing it's from session 4. Toes also look a bit iffy and clip into the ground instead of curling at times.