Disclaimer: Yet again, not mine. I apparently own very little.
You should have killed her. If you had, she wouldn't have got him, he'd be safe. It's all your fault. One more curse, one more shout, a scream, if you'd just kept her talking, kept her busy. Just away from him. You'd do anything, anything, to bring him back.
But she, she will pay. If Neville doesn't get her, if Harry doesn't- oh who are you kidding, you'd go after her now if you could. So many people have a claim to the life of Bellatrix Black but you will get her. You promise yourself that now. She is yours. She will never, ever take someone from you again.
You hate her. Your mum, she watches you get slowly get consumed by grief for Sirius and then, only then, you remember this is her sister. Your Aunt. Aunty Bella. In another life maybe. The Black sisters. All split up by one cause, one stupid prejudice.
It's his fault really. If he hadn't done that, believed his stupid dreams, Sirius (closest to a sibling) would still be here. And he'd kill you for that though, Tonks, you silly girl. It's not Harry's fault, it's not yours, not Sirius's, it's Bellatrix's. And she's going to die for that.
You lie on the floor, watching her face blur slowly. She didn't pay. You'll see Sirius soon. She got you too. Neville'd better get her.