Unfortunately for them, a modern-day Berserker with a baseball bat shows up.
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The true berserkers fought naked, which apparently helped freak out the enemy. This guy appears to be shirtless with bat in hand. Semi-berserker.
Berserker, Norwegian berserk, Old Norse berserkr (“bearskin”). I thought they fought in bearskins? Either way, this individual is a credit to his tribe.