Think about it...
That ship could have just left after the bomb was on the corvette. No other fighter patrols were coming in, because the one that came back was destroyed.
Did the frigate stay to mop up fighters?
Because I think that ship could have just left as soon as the team was on and all the covenant fighters were destroyed no?
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TO people saying it should have disengaged: Yes, in a perfect world it should have. Yet, it was merely minutes after (possibly as short as a minute and a half) dropping it's compliment into the [i] Prayer's [/i] hangar. It might have already been attempting to or otherwise unable to disengage by the time the death blow was imparted. Still, Her captain should have positioned her underneath the Corvette instead of right alongside it. The [i] Savannah's [/i] batteries were flexible. The Corvette's was not.