Hello Anatole Ghio.
You did an excellent job of interpretation based on the info provided. Here is a bit more detail and my self interpretation.
The killer in the dream was a projected representation of my feelings about a particular male in my life at the time. Granted people in dreams do reflect certain aspects of the self as do people in our everyday life however, I know this to be more a projection based on pov.
In the dream, I assumed the pov of the girl (hostage), a third person pov, and the pov of another person who was present in the warehouse searching for the hostage. I never assumed the pov of the killer. I wish I had because it may have given me much more insight.
The killing and use of the victim's faces represent my actual negative attitudes and feelings about two things:
1) My negative attitude and feelings for this person's many false personae.
2) My negative attitude and feelings about my inability to help this man move beyond his false personae and accept himself as he is. In this case, the killer represents my inability to deal with personal/professional failure.
Additionally, the faces and the killing of others represented the destruction of relationships that false personae eventually cause.
The warehouse being a building is very much a reflection of the self. In this case, I dreamed of a warehouse as opposed to a home because of conscious influence. To me, a warehouse is "neutral ground" unlike a home or other buildings which have much more symbolism attached to them.
The hostage situation is obvious in that she, being me, was trying to deal with feelings of helplessness and being forced to cope with situations as they are/were.
The third person, the one searching for the girl, represented my ego defense and need to free myself from the situation at hand.
I think I'll stop here but as you can see, dreams are much more than just dreams. I feel that dream exploration is significant. The ability to gain and recall as much detail about them as possible is very important.
Sincerely,
Gehanna
PS- I have had lucid dreams and I also experience dream paralysis.