Board Thread:General Discussion/@comment-4427410-20160805014450/@comment-14267015-20161001022621

Loki had deliberately made the Stone do that, most likely setting some sort of delay or timer. Also, it was made clear that Banner was his target so he may have made it so it would only activate in his presence. Aggression25 is right in that it increased whatever doubts and worries everyone affected by the Stone already had, but more than likely the reason it doesn't do it anymore is because no one has tried to make it. The Other specifically stated Loki had to learn how to use the Sceptre, it would follow that you can't just will it to do something. Vision may also be unable to affect organic minds in that way. The Mind Stone amplifies the abilities of the wielder's mind, he doesn't have an organic mind so he can't manipulate them like how he did to Ultron to cut him off from the internet.