Key TakeawaysGameStop shares plummeted in premarket trading Wednesday after the brick-and-mortar video gamer retailer announced a 20 million share offering and reported a 31% drop in quarterly sales, as consumers continue to pivot from physical discs to digital downloads and game streaming.Wednesday’s projected earnings-driven drop opens the door for a potential breakdown below the lower trendline of a symmetrical triangle.Investors should monitor key post-earnings chart levels at $18.50,$15.25 and $13.25, ...