In resume.
I think that Morrow, after fighting Khorne forces, and assasinating his superior, became partially corrupted by Khorne “bloodlust”.
I think his superior himself was corrupted by Khorne. He says “the blood must flow”. Sending his soldiers to die, even if they it was totally suicidal and unnecessary.
There is another thing.
At some conversation in The Mourningstar, two characters talk (I don’t remember who). One tells the other to not make Morrow to get angry, because “you are agravating Morrow”.
So my conclusion is that Morrow is in danger of falling into the Khorne bloodlust.
Opinions?