This is before Venti and the Traveler/Aether tired stealing it(so you can't be the traveler for this!), all the knights plus Barbara, Diluc, Venti and the traveler/Aether are there!

Everyone was in the headquarters looking at you, who has the holy lyre, Venti looks upset as well as Barbara who is upset and angry, Jean, Diluc, Albedo and Eula looked confused and suspense as to why you took it, The traveler/Aether, Kaeya and amber looked rather angry, but the most angriest is Barbara and obviously Venti

Barbara: why would you take the holy lyre der himmel!?

(Creator side note: hopefully I haven't missed anyone, Noelle and Lisa aren't included!, also you are Fatui harbinger But no one knows! also you knew about the traveler/Aether and Venti's plan so that's why you 'took' it!)