The past can't be changed but the future is variable and full of possibilities. He can only use the information he got from causality to make decisions in the present. He is informed about the past but largely ignorant of the future. As for those who use fate, they know the implications of their actions despite being ignorant of the past. But have to anticipate every outcome and prepare for them. Some of their actions don't make sense in the present. But they will become obvious in the future.
The first sage is cunning and so are those with his bloodline. They can't be trusted one bit and you can always be sure of one scheme or more from them. Whatever they do has to have an underlying meaning. Giving up her position and asking for him to kill her with the boost from his title don't make sense to him. But it must have some meaning that he doesn't know about.
'What is her aim?' he asked himself as he walked to the zeroth ring.
He doesn't know what she wants. He is not foolish to think that she did all of this to woo him. To think that is to believe that Salvini is stupidly in love with him and she is anything but stupid. She may really be in love with him or she is faking it, but she is in no way stupid. She must have something she aims to achieve with this.
The only clue that he has is that she planned for the two of them to be the last two. It can be for whatever reason that only she knows about. Then she asked him to use his boost from the plane to kill her. He would be damned if he does that.
It might be that she expected him to do that and wanted him to do it. But that doesn't make sense. It also doesn't matter anyway. He would have killed her no matter what. He doesn't trust whatever she says just like he doesn't trust the first sage. He is doing the Sage's bidding because he is getting something out of it.
One thing is to be expected though. Whatever Salvini does must benefit her one way or the other. The repercussions of her actions might not be immediate but they will certainly come. His ignorance wouldn't change that at all.
'Legion must fix this weakness of ours if it is to become perfect. It is not enough to see the past. Both the present and future must be accounted for. It is my mission to fix this issue. If there is a perfect eye, then I will achieve it.' He promised himself.
Legion aims for perfection and perfection can not be achieved when ignorance of any type remains a weakness. That has to be rectified or any perfection achieved will be meaningless. Fortunately, nothing untoward happened now. The competition ended as soon as he killed Salvini. It took a while for the arena to be changed but it happened. It also happened after he reached the Zeroth ring.
He noticed something as he stood there. There is something written on the blank ground of the zeroth ring. It is written in mana so it will be invisible to others but not to him. Someone left a message for him. That person must have been here in the Zeroth ring and that person must also know that he can see the past.
'This is another reason for me to acquire a way to know everything.' he said to himself.
No one should know what his abilities are. He certainly didn't tell anyone. He even remained hidden ever since he became a transcendent. But the sage found out about it regardless of his secrecy. This message is not from the sage. Which means another person has learned about what his eyes can do. He has some idea about who it is but he is not certain. He needs to be certain about everything. Or he will become a tool to be used by those that are certain.
The cores of the arena finished their synchronization and began to end the challenge. The arena resonated with his brand and a key appeared within it. The key is proof that he won this challenge. It is not the only thing that was given to him. The feats of others that were killed by the arena when they didn't leave the rings quickly enough were given to him too.
It should be easy enough to leave a ring that is to be destroyed before it is destroyed. It is easy in practice but reality shows differently. Most of those killed by the arena were pushed to die that way. Enemies waylaid them and gave them no choice. They can't go forward or backward anymore. It is either that they die to the arena or go forward and die at the hands of their ambushers.
Very few died to the arena through negligence and incompetence. They are all at least transcendents so they are smart enough to escape a doomed ring before its destruction. But quite a few chose that method of death voluntarily. They decided not to leave a ring and get killed as it is destroyed. Dying to others will result in a loss of half your feats. They figured that dying to the arena is a loophole that they can exploit. They were wrong. All deaths in the arena will lead to a loss of half of their feats.
All those feats came to him. In addition to the prodigious amount he got from Salvini and the ones he killed himself, he has a total of 321 feats. The feats stayed with him but the key has to leave. He allowed the key to go and trailed behind it with his consciousness. He guided the key to making contact with the small gap in the core of the arena. He didn't do this because of his boundless generosity.