Vampires are nearly unstoppable. They exhibit increased speed and vastly enhanced physical strength (enough to twist open a steel padlock using bare hands). As long as they have a supply of blood, they can heal grievous wounds, including massive brain injuries, in seconds. The only way to kill one is by destroying the heart, which is protected by an area of steel-hard skin. The vampire is weakest when it regurgitates blood - usually to feed another vampire - and can potentially be killed with a single shot at this moment. Arkeley himself uses a Glock .23 with cross-pointed bullets, which fragment within the target's body. It is suggested that a vampire with reserves of consumed blood in its body may be able to heal damage to its heart in time to prevent its death.