The Korean Association of Speech Communication, 3. On the basis of sociogram and the coevolution theory of the complexity this paper focuses on the hypothetical mutagenizing strategy of communication expressed in Spanish intermediate sentence, in which neutrally stable strategy or technological equilibrium of any participant in such communication is damaged unwillingly according to unexpected action against the proper intention of the psychological agent ― not the subject of the sentence. To evit ignoratio elenchi arguments are restricted to several cases of Spanish intermediate sentences for the sake of descriptive simplicity and explicit convenience, citing ad hoc theories to make generalization of pragmatics situation mutatis mutandis on the assumption of that the existence of hypothetical mutagenizing strategy would be a clue to prove a kind of speech act in the socializing process of communication coping with unforeseen accident.