There are curses flying everywhere, shouts, screams, the castle shakes, and Stephen Cornfoot is running. He is sprinting down the length of the Great Hall, shoving people out of his way, looking for her.
Why did she come back? He had seen her get up with the other Ravenclaws. He had seen her walk towards safety. She had looked at him, pleading. But he had remained in his seat. They had discussed this. She knew that if it came to it, he would stay and fight. He knew that if it came to it, she would keep her promise to him, and walk away.
She had broken her promise.
He had seen her, carelessly throwing herself into battle, just out of the corner of his eye. Then he had lost track of her in the confusion. When he found her again, he hadn't thought, he had just screamed her name, and then he was running.
She turned towards him, her mouth forming his name, and then she is running to meet him. He reaches out his hand, she reaches out hers, and then there is a flash of green somewhere to his left.
The last thing he sees is her eyes.