Board Thread:Spoilers!/@comment-4453062-20160217065238/@comment-6175354-20160428210142

Hmcooper4 wrote:

And that something that Hades has planned is likely something that Emma learned as a Bail Bond's person, which is why he chose her (besides which she is probably the strongest magical person next to Hades, which always makes for a good ally), and which will lead into the flashback of the week.

Not all is as it seems in that flashback. Which is why I think Hades might know Emma, from back in her bailbonds person days.