Open Door, Not a lot is the easy answer. But "Use ManPitch Trim" on the PFD, & a couple of small x's. I'm trying to answer some questions but really you need to do a type rating to understand the BUS as simple explanations don't cover the complete picture. Trouble is a little knowledge tends to confuse the issue as the control laws are complex, hence my comments on give the crew the benefit of the doubt until more is know of the event that caused the tragic outcome. O.K.