Characters
He's delirious. He thought I was Buffy.
— Willow • Buffy the Vampire Slayer

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker explains away an odd remark or reaction by saying the other person is delirious and mistook the speaker for Buffy. The brisk, matter-of-fact tone treats the mix-up as a symptom of confusion rather than anything to take seriously.
Context reviewed