How did Young Sean know where Original Sean died?

I can make and did make up an explanation, however, I feel that the director/writer should have included this to support the dual ambiguity of the plot. I just wanted to know if it had been edited out or was it an oversight? I think if they had included some sort of allusion to how he could have known this fact, then it would have strengthened the film. It only needed a minute conversation, even, just a half-interupted conversation that upon subsequent viewing from a different perspective, the audience could have said, "Huh! I missed it. It was right there."

I don't think Nicole Kidman's performance was extraordinary in this picture. Not much to work with I'll concede, and no, I don't need someone running around screaming on the screen to indicate a fine performance. I actually prefer subdued and realistic 'acting' where the person relies on body posture, facial expressions and vocal cadence and intonation. I found that since there was VERY little dialogue, the actors must be extremely strong on other communicative fronts, and maybe due to the botox, I don't know, her face seemed flat and emotionless. Yes, she was in shock, I'm sure, but it was a bland movie. I compare to something like Ordinary People and there is no comparison. Both are slow moving films that don't pander to the audience, but the acting was far superior by all parties in O.P.

Such a shame, because I was really drawn in at the beginning and felt that ALL the elements were there for this to be a great film.