What am i supposed to say about this?

My friend is a christian and he told me a week or so ago that he saw a witch astral project near him or something. I don't remember all the details . But i wasn't sure what to say so i said nothing. I don't know whether or not to believe him. I don't believe in witches or Christianity any of that stuff and i don't think that stuff makes sense. I don't know if i believe in beings that can come from the universe in a invisible sort of shell and communicate with you. What should i say to him when he says these things?