i don-t think so. the stage direction before that dialogue is:

(ROS and GUIL ponder. Each reluctant to speak first.)

if the dialogue should be clearly about who speaks first, wouldn-t the stage direction have been something like:

(ROS and GUIL ponder. Each reluctant to speak first. ROS tries to say something but does not) ?

i mean - you could play it like that. But then to me some of the beauty of that dialogue is lost, that comes from the fact that for the spectator it-s not clear what is the subject of it.