I'm guessing that this was your guide, but it could have been your own projected double. (Look up "Dweller" in the AD-Pedia) About your screaming: Are you sure it was your astral body and not your physical body? Sometimes the feeling of an intruder in our bedroom can cause an involuntary fear reaction and screaming is not out the question. My questions to you: Did your mother actually hear you, or did you just think it? Have you asked her? Were you actually afraid?