I was doing this mission today, i was doing everything as i do genarally, alpha to destroy the rear LRED, Delta to the left flak, me to the first downside beam, thend estroy right flak, ream, destroy remaining two beams.
This part was fine, all 4 beam, flak and LRED destroyed.
Now for the Demon, as it arrived i order to engage all, since the deamon entered first, every1 ignored the fighters (this is another AI flaw, since i think fighters should always give top priority to fighters and bombers and not big targets), i destroyed the beam atacking the Thebes with a Helios, then disable it with another Helio, and AI destroyed another beam, and it was at about 9% after this, i launched the remaining two helios at the last beam, im not sure if the beam was destroyed before the deamon was destroyed.
The objectives says it was accomphised. Then command say to return to base, the 4 Shivan fighters where still alive so we killed them, and i finished the mission.
In the debrief i got a "But you also helped to eleminate the Beleth... etc"
And then, "A Vasudan never leaves the field of battle whiout authorisation... etc", mission failed... wtf