Joahan.
As I mentioned before, I have no means to know if it's Nero, one of his followers, or something else altogether. That said, they don't seem to be in a rush to murder any of you as they gave the Dark Knight ample time to take matters into his hands. I don't think killing you on its own would achieve anything. We do need you alive and awake; that's why we worked together in the first place.
Their movements are limited for a plethora of reasons, the main one being that we aren't in a world made of magic.
What makes you think I would possibly send the guardians to help you in moments of need? I don't know what gave you such an idea.