We'd be grateful for that. Waste not, want not, right?

[It's all the reaction Seras gives, a reflex she can't help. She keeps herself under control, patiently telling her body that they'll get to drink soon.]

Thank you. I wouldn't want to risk your health but...

[But starving vampires are risking everyone's health when it comes down to it.]

If things get desperate.

[She promises.]