Correção de "The tree fell down and blocked the road''

My teacher told me it's wrong but forgot to explain it to me. Does anybody know why?
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FALL DOWN is a phrasal verb that consists of a verb with a preposition, the meaning of which is different from the meaning of its separate parts. This phrasal verb actually means: To fail to meet expectations, Lag in performance.

Suggestions:

The tree fell and blocked the road;
The tree has fallen and blocked the road.