I can't speak very properly about this topic,because I read the s.s. rather after having seen the movie,and in a Spanish translation; so,although global words are the same,surely some descriptions nuances have been lost in translation,what avoided me to catch all the majesty's that Annie wanted us to feel.However,I suppose that all these descriptions surrounding some key moments of their staying on the mountain,are written so as a way of remarking the quality of "Paradise on Earth" that BBM had for them,both physically and emotionally.And the fact that they described the beauty of the landscape when they spent their first time together as a friends,their first sexual encounter and their last moments together-their last on that summer on BBM and their real last time being Jack alive-.All these coincidences,are only a way to heighten this quality of tragic beauty of the mountain,always in contradiction when the real world they were going to find when they came down of it ; that was more tragical in the case of their last encounter,when this real world was going to be their main enemy,their cage,in comparison with their freedom in BBM,their shelter,their Paradise.Yes,for me it could be a symbolism in the majestic description of Brokeback beauty.