And since the course of a dialogue cannot be predicted by one of its parties alone (as you have pointed out with such recondite acumen), the only thing to be done, I suppose, is for the one party, as far as possible, to do all the dialogue by himself.
Eta, elkarrizketa baten nondik-norakoa ezin baitu alderdietako batek bakarrik aurreikusi (zuk hain agudotasun apartaz seinalatu duzunez), egin daitekeen gauza bakarra, noski, zera da, alegia, alderdi horrek berak egitea, ahal dueneraino, elkarrizketa guztia bakarrik.