They all had different reactions to Slade's appearance.
Robin said his name with hatred, his eyes narrowing.
Cyborg stand a bit taller, his arm shifting into the sonic cannon.
Starfire's fists light up in righteous fury.
Beast Boy growled, and shifted low to the ground, ready to pounce.
Raven's eyes glowed, and raised her hands, ready to say those magic words.
Terra would shudder before reacting, eyes and fists glowing, certain that Slade could see right through her, into her thoughts. And whenever his gaze would pause on her, she'd tremble at the thought of what she agreed to do.