Shorts are desperately trying to make this look like a momentary spike. However, there is such strong volume still buying here, that it is forcing the short-selling hedge funds to sell short more in bursts to try to temper the rising tide.
This puts the shorts in a double-bind though, because now they have sold even MORE shares short, that they will have to cover. When margin calls start coming in tomorrow (triggered at the closing bell today) the upward trend will be pushed further again.
Hedge fund managers realize this, and have a mutli-day attack plan to try to repress the spike in share price. They will be covering their short position on any down day in the overall market, in order to get out from under their losing position, without spiking the stock price up.
This will create an enormous amount of support, and a rising floor in the stock price as the shorts have to keep increasing their buyback prices. This will create long term stability in this stock and keep driving the share prices higher.
Traders may just cover some shorts going into the market close so they don't have to worry about this thing running up next week. So hang in there longs... at least a few more hours. Don't give the shorts ammunition.