From this, we take it that he saw a human shapeshifter or perhaps an alien.
Corgan was appearing on the Howard Stern Show when the topic of his appearance on the Alex Jones Show came into it.
CORGAN REVEALED HE HAD A PARANORMAL EXPERIENCE
This is when Corgan made a revelation of his own about a paranormal experience that he had. He said that he did not want to add to a conspiracy but he had also had some paranormal experiences in his own life that might come under that category. He went on to say that he was embarrassed about the experience that he had and he would not give away many of the details, but he did say that he had seen a person transform into something that he could not explain.
Corgan said that he would only say that he had seen someone once undergo a transformation that he could not explain. Stern asked him whether that person had transformed into something that was not human and Corgan replied that yes he had seen it happen.
CORGAN WAS VAGUE AND WOULD NOT GIVE AWAY MANY DETAILS
Robin Quivers, the co-host of the show asked if Corgan was taking drugs at the time but Corgan said that he had been totally sober. Corgan later went on to say that the other person had acknowledged that they had transformed but Corgan refused to add in any more details about what had occurred. He then said that he was being vague on purpose. So Billy Corgan firmly believes that he saw something that cannot be explained away by modern science.
At the same time he did not actually say outright that he had seen an alien. He only said that he had seen a person transform into something that was not human. Surely this must mean that he saw an alien lifeform, what else could he have seen?
Interdimensional Being Caught On Camera.