Got it! What a great interview, of both of them.
***
As for the ambiguity, I think that remained quite well in the film, in particular in Anne Hathaway's careful performance of that scene. I could speculate that as a director, Ang Lee maybe had to find a way for the story to unfold in his own mind, so that he could proceed with decisions about tone and give direction to Anne, and put the flash of the murder in the right context. Ambiguity may be the context, but just as we feel a need to decide one way or the other here on this board, I'm SURE he and the actors needed to find a way out of that ambiguity too; if no one really has a clear belief of what happened, the scene could very well slip from ambiguity to confusion or irrelevance. It didn't, thank goodness. It was brilliantly done, in part because Heath knew that Ennis *believed* in the tire iron, regardless of what Ang himself believes.
-backtobrokeback