It is Crookshanks who notices that Caspar has come to watch his witch work her magic. He sits tall, but meows softly at Caspar. Come over here, human.

If Caspar can sense magic, he would get a sense of some strong wards being crafted and placed around the balcony. Hermione is careful in her magic weaving, letting the magic guide her to the best places to anchor the spell.

The anchor to the north is the most important to anchor the other protection spells within the apartment, which will complete the ward.

Hermione pauses for a moment. And smiles over at Caspar. "Would you like to help?