He let out a little laugh at the look, honestly expecting it to some degree. He knew it was hard for most anyone to believe, but especially those from time periods where man had not even made it to the moon.

"Or starships, if you prefer. My job in my world was traveling the stars and discovering new worlds and people," he clarified, or perhaps just muddled it. It was always hard to tell.

He shook his head to the Seller's question. "No, not as of yet. Still being careful, but everything you sold me last time hasn't triggered a reaction. So you're my favorite medicine seller for it." He cracked a new smile, though he has a feeling if it's returned it won't be in quite the same way of the man found humor in any way like a human might.