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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I wonder why neither the Supercarrier or the Corvette destroyed the Frigate the moment it came in view.