TV version The Pella was changed from MCRN light frigate(Corvette class like the Roci)which carries total of 20 missiles inside of two magazines, capable of max. 4 missiles per salvo, to MCRN light cruiser, which carries 160 missiles, capable of 15 missiles per salvo, and still, Marco so eager and motivated to destroy the Roci, never actually uses capabilities of his ship to overwhelm Roci's PDCs and get it over with, quickly and swiftly, and instead continues firing 4 missiles per salvo..
The Rocinante keeps flipping 360 degrees too fast, over too short period of time for the ship that size, creating G forces too high even for strapped in crew to bear without severe injuries or worse, while members of crew unstrapped again.
The Roci is firing rail gun slugs at 10km/s slug velocity, while moving to opposite direction at unknown velocity which, either way, decreases slug's velocity to unknown extent, and even if FN is accelerating at unknown rate towards the slug, practically canceling, or somewhat overcoming the effects caused by Roci's vector, still FN engaged the Roci from the distance of a missile lock which is over 1000 km and more, but somehow Roci's slug reaches FN in 4 to 5 secs.