Looking for a sharp downside reversal in S&P futures

Prices completed an ending diagonal at 3233, where wave ((v)) is just above a typical .618 multiple of wave ((iii)). This implies a sharp reversal back to the origin of the pattern, which is 2923. A decline below 3120 would leave a corrective structure behind and provide initial evidence a reversal is underway.
Chart PatternsElliott WaveTechnical IndicatorsS&P 500 (SPX500)Technical Analysis

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