This lethargy made Kirei’s focus dull. He could not have realised that the opponent would actually sneak in an attack at this momentary gap. Nor could he have known that he would be the next to experience surprise.

There was a piercing pain between his brows, and a sheet of red covered his field of sight.

Kirei instinctively raise his arms to shield his head before he understood what was going on. A rain of 9mm bullets showered unceasingly upon him. His sleeves, made of Kevlar and covered in protective sigils, barely managed against the force of the bullets. Kirei was stunned.

Kiritsugu was surprised that he was still alive. He had already been prepared to die when Kirei drew near. Kiritsugu’s heart and lungs had indeed been completely destroyed, and all he should have been able to manage was a final, feeble struggle.

But the fatal injury had healed, moments before his oxygen-deprived brain would have begun to die. Kiritsugu, of course, knew of no healing magecraft powerful enough to heal injuries like this. Nonetheless, he immediately understood what was going on.

The Noble Phantasm, Avalon. The holy relic that had summoned Saber; the sheath of the holy sword, which had protected Irisviel’s body for so long. Irisviel had separated the sheath from herself, giving him the miraculous sword sheath that protected its wielder from any harm, and prevented them from aging. Kiritsugu, Saber’s true Master, could obtain prana from Saber, and so exert the sheath's powers as if he were its true wielder.

Kiritsugu had heard of its ability, but had never seen it with his own eyes. He had not expected the sheath to be able to heal fatal injuries. Though still shocked at the power of the sheath, Kiritsugu began to consider battle tactics the moment he realized that he had been revived. He left his eyes closed, and suppressed the urge to cough as his body regained its ability to breathe, and played dead, waiting for the chance to launch a surprise attack.

Unfortunately, the Contender's barrel was still empty. If he wished to attack the other unawares, then he could only use his left hand to draw the short automatic machine gun from his chest holster. However, since Kirei’s protection against bullets were near-perfect, only a direct shot to the head would give Kiritsugu a chance at victory.

The target was small, the angle was awkward, and he could only fire instinctively. Nevertheless, Kiritsugu, an expert gunman, managed a hit. Though he hit his target, the bullet failed to penetrate. The bullet sliced into the skin on his forehead, leaving no more than a gash. Since the skull is made of curves, bullets can easily be deflected by bad angles. Aiming at the head is not encouraged in real combat, for this very reason.

- Fate/Zero: Act 16, Part 6