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.
-
Centurion on Mars I kept blasting him with a solar fusion rifle and he just loled at me and kept shooting. I even kept him trapped in a room for a bit and it just made no difference