I had just left work and was visiting friend, while approaching their condo i was walking up steep hill >(leaning forward), bright light made me look up to see what it was I first looked up and thought to myself this is strange place for helicopter and kept walking about a second later i realized where is the sound? as this object was only a few hundred feet above me I what I witnessed was triangle shaped lights could not really see body of craft and there was one light that seemed to be part of triangle but it was removed by maybe 15 20 feet which is what first gave me indication of rotor "helicopter" I am aviator myself and can usally identify craft in night sky. I watched for maybe 10 seconds before it went vertical at speed I can't describe then horizontal and out of sight.