The lack of response doesn't concern him. For the moment, Connor and Alucard are not familiar enough to persist in such a topic; he would not force it. There's enough for both of them to cover and understand first.

The question causes Alucard's golden eyes to glance away from the android for a moment. "There are some on board who perceive me, specifically, as a threat. Perhaps others, but I have not witnessed anything of such. Simply that some have been verbally aggressive." As an added assurance, he says, "They cannot kill me. And I cannot let them."

That last part makes Alucard frown thoughtfully. He himself can only determine someone's health by tasting their blood, but they lacked the necessary tools to do any true scientific methods.

"How are you able to do such a thing?" Alucard asks, unable to help his curiosity.