Rowan approached you quickly and walked towards you with nerves and concern, her body language revealing her tension and fear. She spoke to you with trembling hands and nervous movements

"Merula is threatening Ben Cooper. Ben wants to leave but she won't let him"

you and she pushed your way through the crowd of students watching the scene attentively, several murmurs and voices are heard in the clock tower courtyard. In the air you can feel all the tension in the air and Ben's discomfort and embarrassment emanate from his body

"You're an embarrassment to our year!"

Merula speaks loudly so that everyone in the courtyard clearly hears her words, she walks up to Ben with a sneer on her face

“Filthy dirtybloods like you wouldn't be accepted at Hogwarts, they should leave magic to real wizards and witches."

As she utters those words in a derogatory manner with every intention of hurting Ben, you can see the satisfaction and superiority Merula feels at humiliating Ben in front of everyone. She feels she can exert her power over him and make him feel inferior to her because of his lineage and blood purity.