What specific reaction does Anders have to his vision of a cartoon bubble and how do you know?

Wolff does not reveal Anders's specific reaction to imagining the bull with a cartoon bubble reading "Hubba hubba" (26). However, Anders's reaction must be visible or audible, since the narration goes straight from "Hubba hubba" (26) to the man with the pistol asking Anders, "What's so funny, bright boy?" (27).