Anchor: Such observation is part of the richness, immediacy, and thick description of a case study.
Entailed: The case study's richness is comprised at least in part by observations like this.
Contradiction: Such observation doesn't add anything to the richness, immediacy, and description involved in a case study.
Contradiction: The man shielded his eyes from the sun.
Contradiction: Two men get off a boat.
Contradiction: My secretary does not wish to be a song writer.
Contradiction: a man outdoors without a shirt