I mean, Arya did use her face-swapping abilities to kill Frey.
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And Jon's heritage did make Daenerys unnecessarily paranoid and irrational and was the only even remotely relevant explanation for her sudden freakout and child-murders at the end of the series
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And Jon's heritage did make Daenerys unnecessarily paranoid and irrational and was the only even remotely relevant explanation for her sudden freakout and child-murders at the end of the series