: In a major twist, "Redbeard" was not Sherlock's childhood dog but his best friend, Victor Trevor . Eurus drowned Victor in a well because she felt excluded from their play, leading Sherlock to repress the traumatic memory and imagine Victor as a dog.
is portrayed as a threat so profound that Mycroft used "trigger words" to bury Sherlock’s memories of her existence . A Gauntlet of Morality
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