On the willows there, we hung up our lyres

Galahad is thinking of all the things Lan Wangji does to make learning easier for him when training him -- the way they repeat some steps over and over, until Galahad dreams of them; the way each lesson builds on the next.

Jigglypuff floats down and then, as Galahad hits and holds B, rolls furiously into Marth and flings him backwards.