It's a clever idea, but the execution isn't perfect yet. The beginning of the shots in the cave with Webster saying "He's here!" seems a little out-of-place and too panicked in the new context. If you could somehow edit the sound there so that he just says "here!" or better yet, use some of his calmer dialog from elsewhere in the film - that'd be great. The edit would seem less jarring then and perhaps Webster would seem more calculating and in control.