The moment she saw the teacher, Rose knew that she herself was safe, therefore, she raised her eyebrows to provoke Arya.
"Miss, help! Kara wants to kill me. It hurts so much."
She cried her eyes out.
Kara only grabbed Rose's wrist and didn't hurt her at all. However, the audiences would believe that Rose had been abused because of her sorrow.
The teacher was furious that Arya did not back off as she ordered, but stepped forward, stuck out a leg and tripped Rose up, then left carelessly.
"Arya, let go of your hand!"
Arya was infuriated by Rose's complacency.
She gritted her teeth.
The teacher was here, and they were framed for violence by Rose. Arya knew that she herself would regret for doing nothing in this situation later.
"Miss, I did let go of my hand!"
Rose was anxious to escape, and she didn't expect that someone would stick out a leg to trip her up, therefore, she fell on her face with her forehead hitting the wall, resulting in a bruise on the forehead.