Maybe he should have anticipated the doubt, but with the nature of the subject, Ken did not want to brush it off so easily. No, not when there was that chance.

"Can you be so sure, Yukari-san?" he whispered, before looking at the young woman straight in the eye. "If they can somehow create giant spiders, how improbable can it be to revive...people." He almost said an entirely different noun (proper noun, to be specific) but managed to catch himself in time.

Although, it would not be difficult for Yukari to pinpoint the source of Ken's thoughts, considering the recent events.