Nanoha seems as a series to have the tendency to portray the characters fearing things that aren't that scary.
Diabolic emission? She'd of done better if she punched that shield.
http://img18.imageshack.us/img18/8644/shieldw.jpg
Was that SLB that I'm thinking of?
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For those that belittle their favorite characters, complain about pairings, complain about oversexed images. Stop, thank you.
Fear
Anxiety
Doubt is but a fad. The life of a fad depends entirely on the willingness to support it. Difficulty is a choice. Determination is a path. Your next great idea after your destination is the true goal.