Klaus was with his sisters and the Quagmire's, Isadora and Duncan were talking about their best friend, the one who defends them whenever Carmelita bothers them

They were walking through the halls looking for her, they wanted the Baudelaire's to meet her

After not finding her, they decided to go outside, seeing her reading a book in the grass at that moment. Klaus saw his childhood friend who he had always loved and still does but to hid surprise Duncan also is in love with her