Didn't interpret the trailer scene meeting that way...What I saw was 2 guys appraising each other as probable, and I hate to use this word, companions for the summer. Is he a good worker, looks strong, will he share the job, etc. Someone mentioned Jack posing by his truck, leg tucked up against it, was probably a natural pose for a person at that time, not as suggestive as in an open meat market type of scene. We can see Ennis in the mirror, but can Jack? Given the angles, maybe not. Seems like Jack would be looking at his own shoulder and face. Given the pace of the film itself don't know if the first meeting would be that obvious... maybe later after they had spent some time together, you have to consider that their time on the mountain was not days, but weeks.