As others have said, stock prices are fickle. If everyone expected 4M sales of GW2 months ago then the "value" of those sales is basically "priced in" to the current valuation.
If the product THEN sells 2M (which is STILL a lot of boxes and a lot of cash) instead the balance sheet may show a dip but the stock price could tumble dramatically. (which it did)
Missing your EPS always does nasty things to stock. Its all perception. Tossing a few IP/titles and employees to the wolves may well be an attempt to moderate that opinion which is mostly in Korea. Note that CoH seriously tanked in Korea, and it SOUNDS good to the average Korean investor that doesn't know the US market.
Plus its not just what your stock its doing, its what related ones are doing.
I got laid off from one company because they did deep cuts after missing EPS due to sales being down. (too deep IMO, and not just because it was deep enough to get me)