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The fact that, if not for Lucien's antimagic sword making Cameron panic about what could happen to Falchion, that Chrom could very easily have killed Lucien right then and there!
In Chapter 48, Eiryss gives Mal a massive chewing out for laying the blame of Anna's death on their father. Not only was it not an accident (though Mal didn't know at the time), not only did Mal's actions make Cameron's depression worse, but her brother (albeit not quite the one she knew) is being a self-indulgence arse due to his self-loathing and she refuses to stand for it without saying anything in response.
A bit of an odd one, but Cameron managing to run Tomb of Horrors from MEMORY
We get our first real look at Deathstroke!Cameron's new fighting style in Chapter 56, and it is BRUTAL.