At first Jefferson assumed it was a threat. A coy flick of the wrist, shiny blade, the Hatter was ready to run. He was just as good at that as he was making tea.
Evie's demeanor and calm tones showed otherwise as she continued to explain. Good thing he wasn't anxious...
"And this helps you, how?" He took the vial gently, holding it above his head to inspect the liquid through the light. Carefully unscrewing the top Jefferson waved at the air above the vial to catch a small hint of it's scent the most safest way he knew how. Strong indeed. "Well, I can certainly try to mimic it. It may take a bit of trial and error. At most I've perfected a sleeping aid and a paralyzing agent thus far."
He also had deadly poisons but no one to test it on. Yet. Not that the stranger needed to know.