Shielding his past and future and existing independently of fate and time meant that situations such as someone returning to the past to attack his weaker self would no longer occur.
Moreover, because of their friendship, his fate was intertwined with the girls'. The higher their friendship level, the deeper that entanglement.
From the perspective of fate, girls at maximum friendship could essentially be regarded as one with him.
Thus, this immunity to observation and interference also applied to girls who shared a close relationship with him.
As for the subsequent enhancement to abilities involving fate and causality... well, the only relevant ability Li Qiuzhi possessed was Mona's friendship skill.
"Fate-Mocking Magi's Shadow" could likewise protect him on the dimension of fate. Essentially, any fate- or causality-related abilities below their two levels were ineffective against him and the girls.
Unfortunately, the fate substitute "Magi's Shadow" could not block time-based attacks. Kujou Sara's friendship skill now made up for that shortcoming.
Fortunately, Li Qiuzhi could control "Magi's Shadow" to actively interfere with fate and counterattack, while the enhancement to fate-related abilities from Sara's friendship skill...
Could improve every aspect of this fate substitute's performance, making it a considerable upgrade.
With his current attainments in fate and causality, he basically had no reason to fear any related abilities.
The final effect of "Crowfeather Veils the Sun," attacks being free from causal backlash, was probably similar to killing without incurring karmic consequences in cultivation stories.
Among the myriad things in the universe, certain beings or objects were blessed by fortune and possessed resilient destinies. If someone relied on overwhelming strength to kill or destroy those beings or objects...
Without an ability that prevented karmic consequences, they would suffer an unseen backlash from fortune. In mild cases, they would become unlucky, with nothing going