Twist ending in No Country for Old Men????(SPOILERS)?

Why were people saying it was a twist ending ? It didn't seem like that to me...the only thing about it was how suddenly and unexpected it ended...it was just like BOOM Black screen roll credits. And the unexplained dream the Sherrif tells his wife left a few unanswered questions there... Can anyone who has... show more Why were people saying it was a twist ending ? It didn't seem like that to me...the only thing about it was how suddenly and unexpected it ended...it was just like BOOM Black screen roll credits. And the unexplained dream the Sherrif tells his wife left a few unanswered questions there...

Can anyone who has seen this elaborate for me? Thx
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