I've managed to kill the invaders before they killed anyone and it still won't complete the invaders denied step? What's going on? Am I somehow not doing it fast enough in the already minuscule time frame of 30 seconds? I'm already sick of being made to play gambit, and I dont want to have to start basically throwing matches to try and do this one quest step.
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You need to earn the medal "Not On My Watch," and to get that, you have to kill the invader within the first 10 seconds of their invasion, and before they kill anyone.