What had really happened was that Gabe transformed into his vampire form, and completely overpowered the boss. If it was before, this feat would have been difficult, but from the time they escaped from the facility to now, Gabe had grown stronger, including the others. After he had made the boss turn into a spray can, by cutting all the major arteries and veins, he went ahead to use the blood drain skill and the life force drain skill. He used these skills not to feed his vampire self, but to peer into the memories of the boss. From there, he picked up all the valuables that were on the dead body.
"Hmmm! It looks like they were registered adventurers. Mercenaries also," Gabe said.
