IWM underperforms SPY on the upswings therefore leads on the downswings with divergence at tops. SPY outperforms IWM at bottoms therefore leads on upswings with divergence at bottoms. This is symptomatic of a fear induced 'flight to quality'. Unfortunately due to the volatility of the IWM, PAS chose to put an extra swing in at the recent bottom making the figures worthless for comparison. Note the reduced % on the recent swing high of the IWM relative to the SPY.