$Micron Tech(MU.US) will drop after the market opens, most short positions have been stopped out. If it's 2-3 points pre-market, short positions would still be kept, but now with 10 points, most short positions are closed. The remaining are actively selling by trapped long positions, and long position stop-losses after the drop. The liquidity above is basically wiped out, now only the liquidity below can be killed.