"There's nothing wrong with wanting to help, but there's a thin line between being ready and capable versus being over-confident!" Harry barked back and pointed his wand in another direction, taking another out. Harry would know about that, wouldn't he? But Harry was rarely overconfident as much as he was all too aware of the situation he was walking into and the odds that stacked against him. He heard someone say he was one of the best wizards of his age, but Harry somehow didn't really believe it. There were better wizards out there and many not so cursed to keep screwing things up.
The woman that needed help was apparated away though and then the dark haired girl was running off again. If it wasn't Molly, it was going to be this girl now. Harry had to pursue because the way this girl was going, she was going to get herself killed. Or worse, someone else. No one should have to live with that.
"Kid! Wait!" Harry said, sorely tempted to use a binding spell on her to get her out of there. Disarming her would probably put her into even more danger as she was seeking out trouble. A few more spells were cast and attackers were falling back, but Harry wasn't going to let this girl get herself killed. Sure, she seemed to handle herself fine but she wasn't fighting a bunch of Storm Troopers. These were Death Eaters.