Sword highlighted some things it was feeling during the different attacks, and Shang understood what the Wind Blade Seeds were doing after listening to Sword's results.
When Shang was training, Sword also always gave feedback. Just like when Shang had been at the Soldier Stage, Sword was telling him when a strike felt good or bad.
Shang also felt if attacks were good or bad, but he couldn't be completely accurate.
As the weapon, Sword essentially was a participant, but it could also see the attack from a different angle than Shang.
This made Sword's feedback invaluable.
While Shang had to focus on performing his attacks perfectly, Sword didn't need to do anything and could simply watch everything with all of its focus.
Sword gave the following feedback.
When the same attack was performed, there were always only two different sounds present.
Either the ugly and good one or the good and beautiful one.
