At 51:28, Travis cocks the hammer of the rifle for Natalie as she is aiming it at the doe. Then, there is a cutaway to the flashback she is having about the shotgun incident with her dad. At 51:47, when there is a cut back to the deer scene and Travis says, "Just breathe", the hammer is not cocked. Then, there is another cutaway back to her dad with the shotgun. At 52:34, there is another cut back to the deer scene and hammer is cocked again.
Natalie talks as if Travis' death has been ruled a suicide. But Travis was found hanging from a crane. A suicide by hanging requires some elevated place to step off of. There would be no way for Travis to raise the crane and step off of it. The crime scene would be immediately considered as being indicative of murder, not suicide.