Niel continued fighting the man in the suit, but as they continued fighting Niel was getting nicked her and there. He now had a bunch of scratches on his left arm, a pretty deep cut on his right shoulder, and many more minor injuries all over his body. The only part that remained injury free was his face.
The reason for that was because that was what Niel defended the most. He didn't even allow the man in the suit to graze his face. To Niel who believe in perfection on both the outside and the inside. His face was one of the most important things he has. Even at this point in the battle, where Niel had no more bullets and was barely hanging on, he still defended his face.