He turned to look in a mirror, and caught sight of the barber handing the bottles and jars of waste hair and nail clippings to a girl.
He had rarely seen this sight before, and found it unexpected. 
mnli hypothesis: He had rarely seen this sight before, and found it unexpected.  premise: He turned to look in a mirror, and caught sight of the barber handing the bottles and jars of waste hair and nail clippings to a girl.