On the contrary, I was a bit skeptical with Ennis asking Jake "what are you doing?" in the movie (from what he does immediately afterwards, he probably had a very clear idea of what Jack was doing).
Maybe I'm not properly IT..anyway someone on another forum made me notice that, before this "what are you doing?" , after they jumped up,
Jack puts again Ennis (left, for the sake of precision) hand on his... you know (with his left hand...idem)
We cannot see the hands, but the movement is clear, for me...
this is the moment in which they are gazing each other
then Ennis says "what are you doing"..or something with same meaning , Jack takes off his jacket etc.
Has someone else noticed it?