His guns were generally useless against zombies, unless he hit just right and managed to splatter the brain matter. Shooting them usually just pissed them off even more, but Dean didn't see that he had much choice. The zombie had seen the girl, the girl was frozen in fear, even as the mindless creature was dragging itself toward her. He didn't have time to consider another means of assault.
He raised his gun, held it steady. The zombie paid him no mind. It had prey in its sight, and nothing else mattered. Three seconds later, it was twitching on the ground, gray matter decorated the concrete around its head. Dean went past the girl, and bashed the end of his gun into the creature's skull for good measure.
"Can't be too sure, you know?" He glanced up at the terrified girl and nodded. He considered it a job well done. As long as she wasn't a Croat. That would be just his luck. He leveled his gun, he could have it raised and aimed in less than two seconds, if she showed the slightest sign of infection herself.