[What's keeping Sayo from completely believing in Sousei is his remaining reluctance and distrust. He knows people can make an impact, history was full of such influential people, but they can also fail as well. He doubts the world would ever become completely safe.]
...I will be watching and... lend my blade if Master wishes.
[If Sousei was Haru or any of his previous masters, his response would be... mostly the same but his emotions would differ. The fact remains is that Sousei is not his master. And without any orders, he have no position to intrude in on another's fight.
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Maybe. But... It would be nice if another weapon won't become like me.
[Every swords get influenced by their masters. But he doesn't wish for another sword to become obsessed with revenge.]
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[He's too much of a realist to believe it won't ever happen--but he's also too optimistic to think that they can't make any impact at all.
(Though in this case by "we" he means the Yamainu, alas, he sure misses his squad.)]
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...I will be watching and... lend my blade if Master wishes.
[But it's still something Haru might like.]
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That won't be necessary.
[Oh, that was immediate and blunt. But he has a reason, and that's--]
It will be unnecessary for you to dirty your blade in any way over this.
[He wants to make sure that Sayo doesn't have to become more blood-soaked all for this.]
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[If Sousei was Haru or any of his previous masters, his response would be... mostly the same but his emotions would differ. The fact remains is that Sousei is not his master. And without any orders, he have no position to intrude in on another's fight.
Not unless he get invested in it, somehow.]