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The operative variable in any deadly-force encounter is the compliance window: the span of time between a command issued and a subject's response to it, which is the interval officers use to determine whether a non-lethal outcome remains possible.
The NYPD says that window closed on Sunday afternoon at 126 Ludlow Street in the Lower East Side, when officers responding to an assault call found 54-year-old Wei Chan descending a staircase with a large butcher knife and, after repeated commands went unheeded, opened fire.
Chan was taken to a local hospital and pronounced dead. Officers had been dispatched shortly after 4 p.m. following multiple 911 calls about an assault in progress.
NYPD Assistant Chief Melissa Eger, speaking at a Sunday evening news conference, said officers entering the building found a trail of blood leading up the staircase.
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