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Once in the capture zone, press OK to change to the scan view
After you captured the Vampire, the view changes as you rotate the scanner around the Compass Cardinal Points. (N, E, S, W). When you spot the vampire in one of the views you can press Capture and confine the vampire. Be warned once you capture the vampire your lifeforce begins to drain away.
One of the Tomb views has the name of a God that kills vampires. At least in comic books anyway. Find the name of the God and enter it before your life force runs out.