This is a good example of characters having interesting interactions when they are made "fully CBN". PoP, when made CBN by Foretelling Angel, can't be negated by anything, even though his original ability provides a way to do so.
Another similar example is The Judean Mediums banding to Trembling Demon when the opponent has used a Draw or Search. TJM makes TD CBN, even though TD's ability allows the opponent a way to discard a GE from hand to negate TD. Well, the opponent is still able to discard a GE to try and negate TD - in fact, they have the CBN right to do so - but that still isn't able to negate TD's now-CBN protection of LS.