In this video, David Bowie saw the supernatural (Devil) in his swimming pool which left a permanent mark at the bottom floor. His wife Angie Bowie, thought at first that he was hallucinating but she herself watched the pool for 4 hours and saw nothing but later found the permanent mark of a demonic figure at the bottom of the pool. They both were afraid and left their house permanently. The next owner of the house covered the demonic mark at the pool many times but it kept coming back no matter how many times they've tried.
In my experience with people that I have known, someone whose faith is weak is very vulnerable to this supernatural thing. So, I believed that what happened to David Bowie and his confession or interview were all true. His wife was not in drugs nor anything when she witnessed the incident.