 Briefly, every casus which is not explicitly inconsistent or impossible in a way not easily imaginable (such as a man being a donkey etc.) can be admitted for the sake of disputation. But first, the respondent has to make the impossibility of such casus explicit and emphasize that he has not admitted the casus as possible but merely as imaginable, to defend its implications (as imaginable, not as possible) and to negate what is incompatible with it in accord with his obligation. ([Soph] soph. 31 [1494: fol. 162va–vb])