Because I am a doctor, and you? You asked me to be your physician. [he has to wonder if it's worth just leaving right now.] But the reverse is not true. You're no healer.

[then he raises a hand, one finger extended, pointing up at the sky.]

I would do the same for another healer, if someone attempted to be my healer-- I would refuse because there's no point in fixing something broken. Anyone who does try so hard... there's clearly they something they want.