Bezoar was one of those places that Lia knew she could find things she needed when she needed them, and since she was often looking for unique ingredients for her potions, it was useful to have someone who could be discreet in procuring whatever she needed. Her fingers lightly brushed over one of the counters and she looked around for a moment before her eyes moved back to Tracey, her arm moving subtly toward the back room, typically reserved for new stock that had not been put out yet. They sometimes got grumbles from the owner for going back there, but they knew not to touch anything without checking for curses first and so they were not put out, instead being quietly permitted to wander as they would.
"Can't. Magic would taint it." She would need to do it the muggle way, and while she had procured the equipment she would need to have someone actually do the collecting, because she imagined she would be in too much pain once the needle was in her hip - since from the research she did that would be the easiest collection site. She would deal. Pain for a little while to help her brother was something she would accept. He was worth it.
Ophelia moved to a small dagger that looked as though it would suit what she needed for blood collection. She would let Tracey bring the conversation to where it should be on her own time, and for now she withdrew her wand, quietly murmuring a spell to see if there was anything on the dagger that would make it unwise to touch. The check showed that she was safe, and her finger brushed along it lightly as she waited for Tracey to speak.