I know enough about them to understand that using the power of an Infinity Stone is no easy thing. They usually destroy everyone and everything around them, include the fool who attempts to use one.

[Thor looks worried. The Tesseract and the Aether should be safely locked away, which would mean a third stone has been found. That is not good. Not good at all.]

I'm glad to hear that the stone is with the Nova Corps. They should be able to keep it safe.

Who was it that used the stone?

[It's obvious from his tone that he's assuming this person is dead.]