Because of Elite ally Jungle Boy, who mocked Punk at a press conference months before (though you can be forgiven for failing to recall it, as the dirtsheets didn't barely bother acknowledging it). Months later, Jungle Jack then threw a tantrum backstage and Tony Schiavone asked Punk to reason with him and dissuade him for wanting to use real glass, then decided to nonsensically reference the fact on-screen during his match in Wembley Stadium, where Punk witnessed it at gorilla position.