IIRC the Horus was seen escorting a
Satis-class freighter (or was it a
Ma'at?) in the very next scene. Also since when could FS ships "nullify their own gravity"? They have
never been shown to do this. I might recall one hovering a few feet above the flight deck while taking off or landing, but that could be using thrusters or simply artificial gravity either being absent on the flight deck or switched on and off. It makes far more sense to assume that it reached such incredible speeds under its own power--if it could generate enough energy to create a shield capable of softening the blow of multi-kiloton (almost certainly nuclear) missiles, it could probably do that as well. And then there's space, where top speed does not exist, period (and your velocity is entirely relative, anyway. One observer could see you moving at 5 m/s and another at 5000 because they have different reference points).
(And guess what? 40k fans think my way, bad example.)
No, they don't. When fluff conflicts with gameplay, fluff wins. Ever been to Spacebattles?
Since FS is a game and game only, the actual workings of the universe and real behavior of various things must be derived from fluff and conjecture, you
cannot trust game mechanics.
As far as I'm concerned, capital ships in FreeSpace
must be much more heavily armed than depicted in the game because there is no reason whatsoever given their size, mass, and power generation ability not to be much more heavily armed. It would be utterly foolish for a ship the size of an
Orion not to have many times the firepower of a fighter; thousands or even
millions (what the
Lucifer did to Vasuda Prime makes a pretty good case for "millions", and bombs are stated to be tens/hundreds of thousands of times as powerful as basic missiles).
The relationship between ships/weapons in FS gameplay is so utterly broken from a storytelling/worldbuilding perspective as to be completely unacceptable.
EDIT: Just thinking about FreeSpace "canon" makes me mad. Interplay needs to license a FreeSpace novel so someone can straighten it out.