Two friendly bots get on both sides of the trade and try to panic longs or shorts, depending on the scene.
The idea that a stock cannot get a bid in the morning Like AAPL for example, then trades $15 higher and they can't get enough in the afternoon does not jive with normal market action without news, but it happens all the time.
Priceline got pumped last nigh and up another $10 on 5000 shares pre-market. The idea that somehow the $60 gain aftermarket was exactly the right amount at a minimum is absurd, never happen in a free market. They simply cross trade, counting on more followers to be jumping in than out.
It will be great when the criminal cartel is ousted and we return to a more real market.