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Hiccup telling the vikings of Berk to shut up in a loud voice, startling them into silence
Astrid telling everybody her experience with the freed dragons and giving credibility to Hiccup, shocking everyone who doesn't know what she knows, which is nearly everyone in Berk, that took a lot of courage on her part to speak out against the village
In Chapter 39, Hiccup has no choice but to confront the demon/Green Death, which led to a great fight seqeunce.