The text makes an important distinction: logicians sometimes employ law and in in formulating relations of entailment, whereas Arabic usage is shaped by established idiom and rhetorical setting.
AspectArabic discourseLogical analysis
FocusAudience and contextAntecedent–consequent entailment
LawSupposition, nonoccurrence, vividness or wishingConditional inference
A technical convention from one discipline should not be imposed on every verse and poem without examining their linguistic and contextual force.