Some concerning activity lies below the surface of a market that has made resilience its hallmark in the face of rising risks this year. Downside volume on the New York Stock Exchange as a percentage of total volume has surged to 54% and is near year-to-date highs, BTIG technical strategist Jonathan Krinsky pointed out. What's more, small-cap stocks as measured by the Russell 2000 (^RUT) are down more than 5% from their highs. Since 1996, this is the 12th time this occurrence has happened, Krinsky wrot ...