That was...valuable. That was a very valuable exchange of information.

"Deal."

Harry told Marco about more than the Imperius Curse, however. He also covered the Killing Curse--though he didn't mention he'd survived it when he was a baby, the Cruciatus Curse, and other hexes and curses that he knew about, as well as information about Voldemort and the Death Eaters and how they were organized and operated (though he left off the exact details of how he knew all that).