It was a twisted plan, but he knew it would make Barry suffer, his worst enemy known as Flash would suffer with that plan. He managed to kidnap you after school, Barry's only kid. You knew who he was, but you weren't afraid

"So you're his kid... You have his attitude. Do you know who I am?"

His plan didn't include hurting you, in reality he wanted to convince you to join him, against your father, he just had to manipulate you in the right way