To Vanras, he didn't care as long as his remaining family was safe. Which only amounted to Farsight at this point.
And if she finds it ok for them to conduct such an experiment, then so be it.
But in truth, he didn't like it. Not after hearing what Reina had to say here. Vanras prided himself for being unemotional and his rationality when it came to making decisions for the city.
A pride cultivated through working under the ultimate Externalist that Wilkis came to be. So he was somewhat able to relate to Reina. He understood why she might have done such a thing.
Might be one of the reasons why Reina was not trialed like the rest of the criminals who might have betrayed the city and caused such a disaster. They would already be fighting in the battlefield instead of being sealed in a cryogenic chamber.