User blog comment:Abyssal Horror/Idea: Darkness Rising (DR)/@comment-3562230-20120420035136/@comment-3258762-20120426123516

Um, Redac, Magnus did want to help, and he could have told the Emperor the message (this is told in A Thousand Sons) but he felt that he had fucked up royally when he destroyed the project, letting Daemons through. Thus, he was willing to accept his punishment. The Emperor ordered Horus to order Russ to escort Magnus to Terra, but Horus remade it to Kill the bitch

If Magnus was told of this, as in by the Emperor and not by the changer of ways who noone can trust, he would stop feeling betrayed and turn to the E. Because Magnus and the E was really close. Damn close. Much closer than Tzeentch and he is.