The combat preview/time-travel is so useful when learning the game that all the approachability feedback I have is rather small, but I'll fire ahead anyway.
The description of the Martyr is a little opaque. It's not at all obvious what the Martyr's "range" is until you see one in the playing field (so an enemy having a Martyr as a hire option doesn't tell you a lot if you've never seen one in action). It is also the only case that I know of where an outpost can get destroyed, and it is not necessarily obvious from the text what that means (all drillers on outpost? outpost reverted to neutral? outpost temporarily non-functional? permanently non-functional?).
The Double Agent also doesn't specify exactly what "combat ends immediately" means. Do the subs just turn around and go home? Warp home? Continue past each other with opposite ownership?