No stock, no matter how well its underlying company might be doing, can soar high forever. So it was with soaring drone stock AeroVironment (AVAV -6.44%), whose price lost altitude at a more than 6% rate on Friday. A new analyst note was the main catalyst behind the drop, which was notably steeper than the 0.7% slip of the benchmark S&P 500 index. Recommendation cut from Baird Well before market open that day, Baird's Peter Arment downgraded his AeroVironment recommendation to neutral from his previous outp ...