Scream "HELP!" to lure her upstairs.
From Create Your Own Story
Harry heard her downstairs, and several evil thoughts ran across his mind, each one worse than the one preceding it. An evil, sickening chuckle left his throat before he screamed "HELP!"
Heavy footsteps came bounding up the stairway. Harry saw a flash of Tonks' pink hair as she rounded the corner. With an evil smirk adorning his face, he leveled his wand ahead of her, anticipating where she going, and said "Imperio!"
Tonks looked up towards Harry in shock when she heard the Unforgivable cast. It was a split second she would regret as the spell hit her in the middle of her chest. The instant the spell hit her, her eyes glazed over, and she she began to sway like a leaf in the breeze.
