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So what they didn't say was taken out of context? I'd like to know how that feat was accomplished.
I think that phrase was intended to say:
“The clip was not representative of the protestors’ chant, but was presented as if it were”.
It was edited by the station to make it sound like the protesters were saying "We won't stop...so kill a cop" when what they were really saying was "We won't stop...till killer cops are in cell blocks." Not necessarily the most pro-police slogan in the world but nowhere near a call to kill cops on sight.