the hallucination of daniel jackson frankly confesses that he is unreal but he is present because there is something she has overlooked. the hallucination of teal'c warns her that this whole scenario could be a result of the hostile alien species mind-probing, with a view to her inadvertently surrendering information about the prometheus' engine technology. daniel then reappears and tells her that the 'nebula' may be a living being which is why she and the alien ship are stuck inside.