Many years ago, when Gu Shenwei and Lotus were still teenagers and still early on their comprehension of the Death Scripture, any routine partnered practice would always ended up turning into a life-or-death duel. Thus, they had no choice but to adopt another training tactic: one of them would go kill someone else, and the other would secretly observe the fighting process. Afterwards, they would discuss the murder process and their actual feelings and experiences to help each other improve.
As their swordsmanship grew more powerful, the chasm between their opinions began to widen even further, and eventually this tactical practice became unnecessary.
As a result, in Gu Shenwei and Lotus's eyes, the Death Scripture was a swordsmanship that its wielder was supposed to explore alone. Even the most basic form of cooperation would hinder the user's movements, let alone the so-called "saber-sword cooperation" that Old Man Mu was shouting about.
