SRL for [unhinged]: On Friday , the stock - index futures market was [unhinged] from the stock market when the Chicago Mercantile Exchange halted trading in Standard & Poor 's 500 futures contract -- a `` circuit breaker '' procedure instituted after the 1987 crash and implemented for the first time .
ARG-M-TMP: On Friday | ARG-1: the stock - index futures market | ARG-2: from the stock market | ARG-M-TMP: when the Chicago Mercantile Exchange halted trading in Standard & Poor 's 500 futures contract -- a `` circuit breaker '' procedure instituted after the 1987 crash and implemented for the first time