Rudy is officially Eris's tutor, but she doesn't want to learn anything but magic. As Rudy struggles to get her interested in other subjects, he realizes that non-stop lessons are causing her stress and proposes a day off in the city.
That was probably Eris's attempt at gratitude.
لابد وأنها طريقة إيرس 
لتقر بالعرفان غالبًا
Ob sie sich damit
auf ihre Art bei mir bedanken wollte?
Creo que intentaba mostrar agradecimiento.
Seguramente esa era 
su forma de dar las gracias.
J’imagine qu’elle me remercie
à sa façon.
Forse non era altro che un suo gesto
 per esprimere gratitudine, chissà.
Deve ser a tentativa da
Eris de mostrar gratidão.
Может, книгой она хотела
отблагодарить меня за всё?