As I recall, in both book and movie, Eowyn was the promised prize to Grima when Saruman killed Rohan. Therefore, maybe he was not expecting to overpower her himself but that grief would do it for him.
As Evisse pointed out, she was almost on the point of giving in (at least that's the impression I get) and that was when she was in grief.
Cheers,
Imladris
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I'm sorry it wasn't a unicorn. It would have been nice to have unicorns.
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