For non-cinematic clarity, here's what the Hive fleet is doing. None of them are engaging the second NMX fleet.
Alpha Wing (three gunships) is providing 'covering fire' for Nirvana from about 2 AUs distance, bombarding the broad sides of any Pillagers that turn to fire at Nirvana and its escorts. They're only using Red Mercury Blasters, a long-range, moderate damage, bomb-pumped laser weapon with a modest rate of fire. They certainly aren't targeting particular sub-systems.
Beta Wing (Sraveena and two other gunships) are performing an attack run on the formation of Pillagers, without focusing on any one ship. Each has two Baby Nuke EMP torpedoes, which they'll attempt to use to disable key systems after opening up with their main turret weapons. They each have four autocannons, but even Sraveena isn't crazy enough to try to use those as anti-starship weapons. They're within 0.5 AUs.
Nirvana is unarmed, but its corvette escort is bristling with anti-ship lasers and ECMs. Though Starjammers are powerful (SDR 4), they won't have enough energy to fire continuously unless the Pillagers fire their main cannons into their energy-absorbing shields... Freespacer tech is funny like that! They're closing within 1 AU of the enemy to confront the NMX cruisers.
They say no plan survives contact with the enemy, maybe that's why they couldn't decide on a plan.