Even though Justin managed to at least connect his fist with Kingsley's face, he failed to even remotely successful in his attack. Sure he had taken down a handful of Aurors, landed a spell and a punch on the Minister of Magic, but he had been reckless, left his partner open to attack and had a wand to his throat. Not his best moment to say the least, even when ignoring his rather disgusting appearance.
One by one, Justin watched as his classmates and friends fell, his eyes connecting with Draco's as the wizard fell. I good bit of rage surged within Justin but he remained still, resigning himself to Kingsley. "Bugger," he muttered, watching his fallen friends and looking for his wand in the mess.