Constance and Everett have returned to the trapped LEOs with reinforcements and a few things on their mind.
Because the Foundation under Constance’s leadership doesn’t follow the established High House hierarchy, its members have been largely excluded from the Halo Security Forces. This hasn’t stopped the Foundation from protecting its own interests, and the various Houses of the Foundation have pooled their resources to create their own shared security force. While not well equipped, this force is fairly well respected in the parts of the Halo the HSF would rather just ignore.