I've got this one. It didn't come naturally, but let's just say a lot of practice and a really special teacher can make anyfin happen. Just step back for a second.

[Time for Feferi to break out a trick she learned in the tower, one she learned from her matesprit. She takes out her trident and plants it into the floor, and that's definitely some water vapor from the air pooling up around her when she leaps on top of it, then spins her body around. That water goes with her, shooting from both her arms as she spins. If that doesn't knock boxes back, she doesn't know what will.]