this is actually the equivalent of brandishing a gun  its a war-face. its the face an animal makes when theyre trying to appear threatening to let other animals know they are going to get fucked up. its a display of aggression.  there are numerous research studies into how cheering at a sports game hypes you up, how scowling makes you angry, and how you can trick yourself into being happy just by smiling. soldiers scream as they charge into battle. it hypes them up. the primates we are evolutionarily related to beat their chest and show their teeth.  all animals do something like this including humans.  thats what this means: it means, quite literally translated, i am going to kill you!
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