Although the arrival of reinforcements on the surface of the battleships could be relevant, until this happened, Eneas had a crucial mission.
Concentrating forces would have been too obvious a mistake; it would have left the enemy fighters at the mercy of electromagnetic pulse missiles. Other probes and missiles hidden in the props around the Thesis were detonated when her sacrifice had been completed.
It didn't affect many fighters, but every little bit helped. As soon as they knew that they would not have immediate reinforcements from space, they dispersed on all the approaching human ships. Put to death, they would have to star in an epic finale.
