To sum up, you are saying if the stock shoots up 15% on not only no news, but actually negative news, including a 7% rise in one day, that doesn't sound sound like manipulation to you. But when the stock gives back a portion of those gains on what could be a valid concern, you scream about manipulation. Hmmm, that seems a bit one sided.
No news? There were at least two upgrades one from S&P with a buy rating and $28 target. Other news TTWO knock out quarter. EA releases Dead Space 3. Ouya release date.
Usually stocks move on upgrades and downgrades from analysts.
Now there is a rumor based on "unnamed sources". This rumor has come out at least twice for next gen xbox and ps in the last two years. This isn't the first time this rumor has come out and nor is it the first time this rumor has come out for the next gen. The same rumor was circulating in 2004 for PS 3. The drop would be justified if it came from the horses mouth, not a blog.
Other celebrities have won lawsuits based on rumor libel suits and I think GME should explore this option.