Logic dictated Julian leave her to run. It would have been smarter than going after her. If he let her go, she would just think something was wrong with her powers and he was unlucky enough to run into her both times. But he couldn't just let her go so upset. His emotions were taking over a lot more than he should have let them. Especially considering that was what ruined his father. But he convinced himself it would help him win her over.
"Excuse me, wait, please." He caught up to her pretty easily, grabbing Parker's arm lightly. Julian made sure to touch her shirt sleeve instead of her arm, just in case. "You're starting to make me think I'm a leper or something." With all her running away he wasn't sure how else to get her attention.