arguably, the situation has actually changed very little due to my flubbed post. Azazel could have blown the ogryn's brains out and turned the gun to you, which would leave us in the exact same position. 

the ork does his corruption thing rendering the ogryn unconcious/paralized in pain, which would leave us in the same position as well. except that the ogryn is alive and being tainted to khorne or nurgle which would likely strip you of an ally as well.