The atmosphere between them became ambiguous, and their eyes seemed to communicate with each other, but Saber's body was tense since the door of the room was opened.
Looks like you're right, I reread the initial chapters, and in chapter 18, there's a paragraph that says: So, unless the wishes make a bit too drastic of a change that could cause problems, I would be allowed to carry out my duties.
I don't understand, he saved Ai and killed Hikaru, actions that changed the timeline, but now he can't even kill Akainu because of ''Fate''. Why?(Google Translate).