The first battle never goes well for the heroes. During the first encounter in As, both Nanoha and Fate get their weapons destroyed and Nanoha gets hospitalized. If the heroes always won, there'd be no chance for growth. (And Signum got pwnt in Force)
And a rock is not harder than Laevantine. Even if she did use rocks, the fact that Laevantine got damaged is the proof what Rising Dragon said: She wouldn't have won, even with a burning tree, or an exploding rock or swinging a burning Touma, or swinging Laevantine.
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