Aiden looked back once last time as he sighed, he wasn't sure what to respond at the moment.
On one hand, by telling her that he was the one who had killed her and was the murderer, she could have two sorts of reaction: The first one being that she doesn't mind and isn't that shocked, and the second being that she would run into the director's arms to tell him all about it.
Aiden obviously didn't want the second situation to happen as it would be quite a bad thing since it would ruin his attempt at killing the director and on the same occasion finishing this trial once and for all.
'It's not like I can go back to the Nova now after everything that happened… They restricted the use of the [Return Stone] after all.'
Aiden wasn't sure, he thought and he thought about a way to make this question go away from her mind. However, even if he were to ignore her then the answer would also be given.