When him and Isabelle were talking in his flat, he was sitting on the floor surrounded with work. He visibly showed is annoyance when Mycroft walked into the room, and quickly the annoyance turned into anger when Mycroft started to treat him like a child. "Have you come here to help, or just hinder my ability to think further?" Sherlock snapped at Mycroft. The bothers glared at one another. "I've come to help," Mycroft admitted finally. "Well we don't need it," Sherlock growled. Mycroft started to laugh, and Sherlock looked to Isabelle, who was giving him a weird look, as if saying 'screw your pride, accept his help'.
Sherlock's lips pursed as he looked back to Mycroft. "What information do you have to give us?" He mumbled. Mycroft gave his brother a smile. "Have you thought of seeing who's bought the items for the poison anytime soon?" Mycroft asked. Sherlock instantly grew impatient, looking annoyed again. "Mycroft, all of the stupid mixtures are common all over the world..." Mycroft had a little, annoying, triumphant look on his face. "Not in the added poison in the first victim... It has violet extract... It's extremely rare, and there are only a few buyers in the entire world..."