(These are the market notes on today's action by Mike Santoli, CNBC's Senior Markets Commentator. See today's video update from Mike above.) A heavy start precedes a sprightly rebound , as the S & P 500 executed a nearly precise retest of Friday's low (6555 Tuesday vs 6551 Friday) before tireless tactical buyers took control. The almost-trite mechanics of this bounce work against the idea that the market has mostly been twitching in tune with the back-and-forth trade-policy threats between the U.S. and China. Yes, the re-escalation of hostile rhetoric Friday was the proximate excuse for the market's uncommonly calm ascent to crack. But it's also about a market caught far out on the risk curve when this macro intrusion struck. The latest leg of the rally has been carried by a gusher of capi

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