Black Siren and Mia in “Unfinished Business”

Black Siren

I don't know anything about changing timelines, but I am something of an expert on vengeance, and getting it... it doesn't do anything but cause you more pain.

Mia

So, what, you're an expert on talking people out of murder?

Black Siren

Kind of. I had to when Felicity wanted to take down Ricardo Diaz.

Mia

My mom tried to kill someone?

Black Siren

No. Because I talked her out of it. And, look, I get it; you and your mom, you're both women who won't allow themselves to be talked out of anything, and I appreciate that. But Felicity, she never regretted changing her approach. So maybe you should try doing things differently, too.