[He's not sure if he wants to tell her all of this, and yet a summary comes spilling out.]

A-ah... Yes! Yes, she acted a lot like you! At least at first. But then when she revealed herself... she acted somewhat mean and light-hearted about everything! She did not need her notebook. In fact, she tore a page of one apart! And she did not care that you were trapped in the mirror world. She did not think that anything would matter due to your condition, and she even called you a lost cause!

[Ishimaru notices that she's writing it down as he speaks. Is this a good thing? Well, yes, it could be helpful for Otonashi to know that she has a mirror to beware of!]