One possible explanation; we think of it as one event, but in fact there were more like two discrete attacks separated by a lull of some FOUR HOURS.
It’s true that they did take some attackers prisoner in the first attack on the Consulate, and that those guys had been relocated to the Annex, i.e., “The Farm”.
So I think it’s possible she is referring to those guys? She might be suggesting that the motive for the follow-up attack on the annex was motivated by a desire on the part of the comrades of the prisoners to free them from the annex...?
Or perhaps there had been other prisoners there already...?