I've seen a demonstration like this before, when the first projectile was fired it bounced off as in the vid. What the guy did next was to put a small piece of plasticine on the tip and it punched straight through a Brittish army tin hat. The plasticine stopped it changing it's trajectory.
Amazing the way that V shaped piece at the top deflected the arrow away from the head. It worked perfectly but I wonder how many deaths it took to realise it was needed.
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