Characters
Oh, leave that one! He looks like he's ready to drop any minute, and I think I can eat someone if he's already dead.
— Spike ‧ Buffy the Vampire Slayer
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker asks for someone who seems close to death to be left alone, adding that eating a person might be possible if that person has already died. The tentative qualification creates macabre humour: an extreme possibility is weighed through a strangely narrow personal boundary.
Context reviewed