Loki

There is no Loki in Doctor Strange. But there is something interesting about the way his character is described in the movie.
First, we find out that the Ancient One didn’t intervene in the Battle of New York because that was just a physical threat. And it makes sense, given the fact that Loki came with an actual alien army, ready to rule the Earth. However, in the credits scene, when Strange meets Thor, we find out that Loki is on Strange’s watch list – so he isn’t just a physical threat.
Make what you want out of this: Is Loki a physical or a meta-physical threat? Even more – is his magic of the same kind as Strange’s, or is it something else?
Should I ask why the Ancient One didn’t intervene when the Tesseract, an Infinity Stone, was used in the battle of New York? It’s made clear in Doctor Strange that the Infinity Stones are something one shouldn’t play with…
