Why do you think Dr. Margolin had the curious experience at the wedding hall?

Dr. Margolin experience at the wedding hall was a result of his death. He met with an accident on the way to the wedding. His curious and mysterious encounter with Raizel could probably be explained through his past. Raizel was his one true love who he never had a chance to marry. She was given away to someone else and was later shot by the Nazis.