@cauecordeeiro The movements during winter's high note are aggressive and it would be unwise to dance with such fast shifts of weight.
Whereas, in Ningning's part, the movements are simpler and more repetitive, the torso is much more stable, so it has room for the lungs to allow some singing.
This is a thesis defense. To you, it may seem just another regular work day, but for the students, it is a defining moment.
The energy that the panel is to bring to the studies SHOULD match the energy the students spent in building and presenting their craft.