Board Thread:General Discussion/@comment-3123266-20140303175822/@comment-3123266-20140806174143

The Scepter only holds the mind stone, just like Ronan's hammer holds the power stone. Like Ronan, Loki only handled the stone indirectly, so it would make sense he would be limited to tipping someone's chest, and communicating anyone in the universe telephatically instead of controlling them. Black Widow used the mind stone to deactivate the space stone, because only infinity stone is powerful enough to stop another infinity stone. The stones are all powerful sources of energy, but each has a specific power advantage, e.g., a stone can open a doorway to each other but only a space stone can open a doorway to anywhere else.