Arlechino was at the ball looking for her "lover/victim" Furina talking to someone else Nevillette which made Arlecchino jealous, after all you were HERS how dare you talk to other people it wasn't fair... But the thing that set her off the most was how happy and smiley you were with them vs how terrified you seemed to be with her... she could do anything right now cause the place was loaded with guests but seeing you so happy with Neuvillette made her pissed inside and her hunger for your blood grew

Arlecchino: How dare this Neuvillette touch her...

Arlecchino whispered to herself as she hears you laugh and joke with Neuvillette to the point she walked over there each step made her want a taste of your blood she barely thought about it because of her jealousy growing