 Heytesbury applies his view of obligationes: in the absence of any other assumptions, (s) is initially irrelevant. As such, if proposed as the first sentence in the game, the respondent’s move cannot be affected by either the casus or the previous moves, but must follow the respondent’s knowledge about the external world. Heytesbury’s emphasis on the stage of the game suggests that this can change due to the dynamic character of obligationes.