That will be for each individual to determine for himself, with the flashpoint likely being multiple attacks by small mobile groups of 5 or 6, [carload] striking at a coordinated preplanned time, likely an hour or two before the hours of darkness, then following on through the evening. Next morning, as the TV cameras appear, they'll then reassemble to complain about how unfair it was that they were attacked when *they wasn't doin' nutthin'*
The situations will vary in different jurisdictions with differing laws, and with differing character and tolerance of different supervisory officials tolerance for that sort of thing. Expect a body count in the dozens, at least, probably fewer than a hundred- initially.
Likely triggers: uncontrolled flash mob looting, communications outages, natural or human-directed, that shutdown ATM and food stamp card machines, or the nomination or election of any white man to replace the present Black ruler. The likely response? Right here you go.