Today on the falconcam you've seen Dorothy and E2 away from the nest quite a bit. They're able to leave the chicks because the nest is warm enough that the chicks are OK without brooding.
Meanwhile Dorothy and E2 have been off camera because they're busy defending their territory. Today at 1:30pm Karen Lang and I saw E2 attack a third adult peregrine approaching from the south. Dorothy had already come back to the Cathedral of Learning with two primary feathers askew on her right wing as if something had hit her. Was that evidence the third adult (intruder?) had hit her? We don't know.
E2 chased the third adult away past Flagstaff Hill while Dorothy circled above Frick Fine Arts. Both of them are still vigilant, gazing toward the south.