So Mahiru shows up and does the whole Eve tempting Adam bullshit, then Mahiru loses to Ferid, some vampire guy. Guren manages to stay standing against Ferid of course and then Shinya gets the drop on Mahiru because of course he does. He wasn't really knocked out because a girl did it and he's a male so it was never going to work.
Now Mahiru needs a maaaan to save her from herself.
You know, I'd say that Guren is acting asexual. Only interested in power and not having any form of sexual interest in anyone. That being said, men are allowed to be "asexual" to only want power and not anything to do with women and only military relationships with other men.
Women are never afforded any kind of disinterest in men, whether they are asexual or just don't have time for men at that point in their lives. Other women are only seen as a roadblock to them.
Now GUren is fighting SHinya, because of course he is.