Passage: Arriving in Barcelona, Langdon and Ambra go to Casa Milà, where they search for the poem. Langdon learns that Kirsch was dying of pancreatic cancer, prompting a rushed release of the presentation. Though he first thinks the poem is by Friedrich Nietzsche, he soon finds a box supposedly containing a book of the complete works of artist William Blake, who was also a poet specializing in prophecies. The box is empty except for a slip stating that Kirsch donated the book to Sagrada Família, leaving it open at a specific page. Soon the police arrive and, as Ambra tries to explain she wasn't kidnapped, Kirsch's phone is destroyed in the chaos. Ambra's guards arrive in a helicopter and get her and Langdon to safety. Langdon assures Ambra that he can find Winston's physical location and she makes her guards take them to Sagrada Familia under threat of dismissal.

Question: Whose phone was wrecked?
Kirsch's