Buffy, Willow and others in “Help”

Buffy

Okay. As okay as-- She told me their family had a history of heart irregularities. But she never told Cassie.

Willow

Cassie didn't know? Then it was fate?

Xander

Then she was going to die no matter what, wasn't she? It didn't matter what you did.

Buffy

She just knew. She was special. I failed her.

Dawn

Uh-uh. No. You didn't 'cause you tried. You listened and you tried. She died 'cause of her heart, not 'cause of you. She was my friend 'cause of you. I guess sometimes you can't help. [sniffles]

Buffy

So what then? What do you do when you know that? When you know that maybe you can't help?