Ok so the transcript for the first page goes thus:
"It All started with a girl....
I joined a corporation that was quite literally evil incarnate. I thought I could channel their resources into something positive. In an existence defined by bad choices, that was my worst. I didn’t change them. They changed me.
Then they killed her. That opened my eyes. I took a stand."
So I'm pretty certain he means Fred.
Yea at first like @Priceless I had to re-read it because I thought , wait is he talking about Cordy? But WH didn't kill Cordy. Cordy did die and he did have a turning point in the vision but she was killed by Jazmine and there was never a correlation between Jazmine and WH in fact they were happy with Angel for getting rid of Jazmine right?
But I also don't really see how Fred dying was a turning point in the WH fight either so, basically I find this line very confusing. They wanted to do an homage to the "its started with a girl" that they did in City of and I get it but it's a bit murky.