Anchor: Some authorities on evaluation methods believe that case studies reflect the author's values in ways that can be difficult to detect.
Entailed: Some authorities believe the author's bias is hard to detect in case studies.
Contradiction: No one believes that case studies reflect the author's bias.
Contradiction: San Francisco is the conservative capitol of America. 
Contradiction: People are outdoors.
Contradiction: The ornate outer walls make it look like a place of worship rather than a fortress.
Contradiction: They can still show up.