Because I thought it was normal to use the friend of a friend to have some anonymity. So I know the person this happened to well but I am not letting my cat out of the bag.
Just trust me they went in great detail about this event. It was even acted out so I have a good understanding of it.
My friend's brother had this friend who I guess told him that they could walk through walls (too many pronouns). Their brother as far as I know retained this knowledge through word of mouth not actually seeing it in person. My friend's brother was quite vague on the information disclosed about this. However I ruled out all other methods besides an ability. I made sure it wasn't a lie, trick, etc. So my questions narrowed it down to an ability but I never got any farther then that. There was an odd deference to pursuing the topic.