I know what the word flank means. It can mean any of a number of things. The enemies back, an attack on both SIDES, an attack on an enemy from behind who is pre-occupied with a frontal assault. These are all regular uses of the term, and all make sense in game terms, since all involve attacking an enemy in a position they are less apt to defend from. However, I don't think it's referring to all of them. Furthermore, having tested, I don't think it can be done without at least one party member, since I've tried each version with people in FATE groups.

As far as Impulse Drive goes, I see it now. I'm just surprised they don't show up until so late.