Yeah, really! Maybe they're mindless or something and only stick to that prophet... mindlessly. Like a Terminator designed only to protect... protection only from threats that are 'pressing' and 'now' and 'urgent' and 'in your face'. Like "We have no brain, but we know when to kick a**."
Or maybe they just couldn't find her, when she's off breaking seals.
But I don't know. It's about 2am now, so my brain isn't exactly not mush right now. ^_^