She looked at Vernon and saw that he was shooting daggers at the youngster. It was clear he heard everything.
Well, actually Marvin wasn't exactly trying to keep his voice low either. He just pretended to whisper, but he made sure the 'bad man' would hear his thoughts and/or plans so that he would stay away from Helena and not disturb her.
"Hey, kid," Vernon called. When Marvin looked at him, he hooked his finger and beckoned him to come over. "Come here."
Marvin scoffed but walked to him obediently. He casually stuffed his hands in his pockets and asked nonchalantly, "What?"
Vernon raised his long hand and easily reached Marvin's collar. He used his finger to hook his shirt and pulled him closer, lowering the tall youth's upper body.
"You want a beating?" Vernon snarled in his ear.