He took his sweet time in articulating a proper answer.
"The Order does not have a single live sample in any of its vast, expansive labs. Your and our samples commited suicide to prevent themselves from being experimented on the long run. Ask yourself a question why your own expired, even if it not eminated plethora of negative emotions towards every single member of your crew. For Nomads, death is inconsequential. In another time, there will be another being implanted with exact set of characteristics that made this arbitrary Nomad personality what it was. Quasi-immortality, their memories live on copied over from specialistic Nomad nodes. Doctor Felix Latham's own words, our specialist on Nomad mindshare theory."
Even for military-man, he sounded knowledgeable about the enemy he fought. He tried to invoke that maybe in Doc's memories he encountered a case of a Nomad, that maybe met his end in combat and came back unscathed days, weeks after. Nomads never utilized anything of sort that could serve equivalent of escape pod. They always exploded, leaving just mist of flesh and pure energy that powered their extensive ship-wide neural networks. Well preserved samples were rarity and live Nomad a fleeting experience...