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His reaction was normal in his revulsion. It is unfortunate that he was unable to control his rage.
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From reading the article, it is apparent that Josh Brandon Vallum is a homosexual.
So, being that he is gay, it should not have been a surprise to him that the dude he was making out with had a penis.
With that, his reaction was not normal and after he murdered the victim, he tried to bury the body. That's murder, that's life in prison.