Depending on how evil you are, he has already experienced “Darling” and knows what you are capable of. If the "Urge" takes over you, you must be truly fearsome that Astarion is afraid of you. UA mentions several times that you are very scary then. He then also reclassifies Alfira's death. The slayer is apparently still cute in comparison. smile

And I hope that's not why you're scary:

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"Now, was that civilized? No, clearly not. Fun, but in no sense civilized" ~ Braingremlin