After Physical Training, a.k.a. the warm-up, Aster would undergo intense Swordsmanship training. Practice swings were a given, but after that, he would also be taught sword styles and formations. It was complicated and hard to pick up due to Ardra's "unique" way of teaching.
Still, there was one section of Swordsmanship training that Aster looked forward to: sparring.
Learning proper postures and styles, sparring was the most effective method to ingrain the movements into his body and consciousness. But Aster had a different aim.
"DIE!"
"Ahaha! Your strikes are getting sloppy again! Fix your posture and slash like tatatan! How many times do I have to repeat it for you to understand?"
For the sparring, Ardra was using nothing but a single branch she picked up randomly. Aster wanted to take advantage of this opportunity to get back at Ardra, who was basically torturing him under the guise of training.