With a casual motion, Antonin tossed the potion bottle into Millicent's lap, saying, "This potion will do absolutely no good for a common cold at all."
"But then, you don't really have a cold, do you Millicent?" He looked down at the wand he was still twirling in his fingers. "Its really a schoolboy sort of trick," Antonin said, "to be able to cast a simple spell while spinning your wand like this."
"Not that I really need to cast any spells when I can smell potion on you. Use enough, and the odor lingers, just like the effects linger in the body. Not obvious, but there for someone who knows what to sniff for. What do you think a little diagnostic spell would tell me?"