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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Anyone who says they can beat it solo are liars. I have 3 32s and the best guns in the game and can't kill it solo. Shield regens faster that you reload plus he runs like a bitch