BUZZ — US stocks weekly: Rate reckoning
* S&P 500 falls second straight week, though dips just 0.1% as Fed Chair Kevin Warsh takes center stage.N * Dow drops 1.7%, while tech-heavy Nasdaq Composite lifts 0.7% * Nasdaq gyrates, survives support test, but upside still capped * Though recent breadth breakdown leaves Nasdaq bulls on alert after the Dow tested a