Sorry, I know I shouldnt have started that about Alma, so lets get back to Ennis and Jack.......
Not to worry, Alma is a big impoortant part of that scene
I think that hadn't she seen them she and Ennis wouldn't had divorced, Cause that is how she knew the fishing trips weren't real. we wouldn't have had the Jack Nasty bit.
I think she put her bag over her shoulder becasue she was going to go out and buy smokes...delay them in the house with the girls, and when they just totally ignored her and went out she tried getting Ennis to come back earlier by asking him to pick her up some... I think it is in the story or the screenplay that he knew she was trying to bring him back earlier by asking him to pick some up
Alma is a big part of this scene...as wonderfull and passionate it is it is a turning point in the film because they ARE found out. THis is the ONE person that knows about Ennis. WE can assume some know about Jack because of what happens to him. But ALma might be the only one that knows about Ennis, because she actually saw him kiss another man like he probably never kissed her...
ANd the scene when they are in bed and she asks him to use condoms, in either the S or the SP she utters under her breath "anyway, the way you like to do it don't make to many babies" She knows that Ennis is gay, and we get to see her discover it here...