Raiders and Flat Out

So I have a dumb question.Can models shooting or of it can be done before. I know after the fact would mean all inside cannot shoot.. Can the warriors embarked on a raider shoot prior to their raider going flat out? Does flat out always take a dangerous terrain test for our skimmers?

If passengers shoot the vehicle can't then go flat out, similarly if it goes flat out they can't shoot afterwards.

Going flat out doesn't require a dangerous terrain test unless you start or end your move in difficult/dangerous terrain.

might just be arguing semantics with this but, under the open topped part of the BRB it states, "Open-topped Transports do not have specific Fire Points. Instead, all passengers in an Open-topped Transport can fire..." Since it is under the fire point section that it says that passengers can't fire on a flat out, and since open-topped doesn't have fire point it wouldn't apply.

It would make since that you couldn't do it out of fire points cause it of the restraining field of fire. In a open-topped vehicle there is nothing to prohibit the field of fire when the vehicle moves flat out.

Back of the book. Has what movement had what effect on passengers in a nice handy dandy chart.