The public event kill target especially on Earth is defective.
So many times they are near impossible to kill and they get to the end point way to fast.
Either fix it or you'll see even more ignore it. All it seems to do is use u all your ammo for nothing.
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I only do those events if other people are participating or I know I can solo it, the minotaurs (to me) are very difficult. Or sometimes I jump on my sparrow and a push him back.