Film lighting

The use of lighting on this clip is used to create a sense of tension.The low-key lighting is used to increase tension and suspense amongst the audience. The colour used is dark blue which could connote evil and danger.The light seems to be coming from the top, which could suggest that something extra-teristial  might be doing something like this.             http://www.youtube.com/watch?v=Mpvv9sNOPng