When the Demon Eye was found and dealt with by the angel, Roy realized that the angels might have sensed his demonic aura.
Therefore, in order to prevent the other Demon Eyes from being discovered, Roy simply withdrew all of them back.
To Roy, the reverted T-Virus was a pleasant surprise. After watching the holy spells of the priests fail to take effect on the T-Virus, Roy realized that the T-Virus was still so powerful. At least, it could not be eliminated by conventional means.
In addition, judging from the performance of the mutants, they were probably stronger than the lickers in the movies. This might be due to the physiques of the non-human special races in the Ashan world.
