Sasuke, Dosu and others in “Unfinished Business”

Sasuke

[under Cursed Seal, to Sakura] Sakura, who did this to you? Who was it?

Dosu

Those marks, they're all over his body.

Sakura

Sasuke, what's happened to you?

Sasuke

Don't worry, I'm all right. It's only the power flowing through me. In fact I've never felt better. He gave me this gift and he made me understand what I am. I'm an avenger. To follow my path I must have power at any price, even if it means being consumed by evil.