Well a Warlock did pretty much just send a Hunter to their death at one point, so that could have started it. Or when the Hunters decided not to stay and defend the city at Twilight Gap.
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Not entirely true my friend. Some hunters chose to stay, don't remember any specific names but a female hunter and her group pushed back many Fallen at Twilight Gap.
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Yea I forgot about that but the majority didn't stay.