The Doctor: They don't know what it is. Vesuvius is just a mountain for them, the top hasn't blown off yet. The Romans haven't even got a word for "volcano". Not until tomorrow.
Donna: Oh great, they can learn a new word. As they die.
The Doctor: Donna, stop it!
Donna: Listen, I don't know what sort of kids you've been flying around with in outer space but you're not telling me to shut up. That boy-how old is he, 16? And tomorrow he burns to death.
The Doctor: And that's my fault?
Donna: Right now, yes.
Donna: You can't just leave them!
The Doctor: Don't you think I've done enough! History's back in place and everyone dies.
Donna: You've got to go back! Doctor, I'm telling you! Take this thing back! It's not fair.
The Doctor: No it's not.
Donna: But your own planet, it burned.
The Doctor: That's just it! Don't you see, Donna. Can't you understand? If I could go back and save them then I would. But I can't! I can never go back. I can't. I just can't.
Donna: Just someone. Please. Not the whole town. Just save someone.
