Petra knew it was stupid to putter around Knockturn Alley just as all the shops were closing up. She convinced herself she was there because she needed venom from a Mongolian Death Worm, which she couldn't find anywhere on Diagon Alley. She needed venom from a Mongolian Death Worm to try a cool new photo effect when she developed her latest roll of film, and she wanted to try that as soon as possible. She'd leave right after she bought it. No big deal.
Petra waved at an old Apothecary as he swung his shop door shut. "Wait," she called. "I just need to pick up one thing." Her bright red hair must've appeared especially garish compared to the street's gloom, as the old witch looked long and hard at her. Petra hugged her cloak around herself, feeling like a rotten tomato oozing all over the street. The witch turned the key in the lock and shuffled off, not giving Petra a second glance.
Petra sighed. Who was she kidding. She was here because she'd walked into Greystone's earlier only to find Dylan, that two-three-four-timing sonofabitch, setting up to play with his band. Maybe she was looking for a little trouble.
Her hand slid into her pocket to feel for her wand. There was no one else in this part of the Alley, but that was sort of what worried her. Maybe she should find a pub or something. Get off the streets. Petra continued her walk down the deserted alley. Her heart sunk a little lower with each hollow echoing tap her footfalls made.
Genevieve was in knockturn alley. She needed a few ingredients for her potions class that she could only get here. She was running late and knew the apothecary was closing soon. She ran up to the door and tried the handle: it was locked. What luck. Gen pounded on the door for a minute and shouted: nothing. She walked away very agitated with herself when she couldnt help notice a bright red bushel of hair in the dark alley. She had never seen this person before so Gen walked up to her slowly.
Gen faced the woman and asked, "Hi. Um I was trying to get into the apothecary for some potions ingredients, do you know anywhere else I can get some." Gen said this shyly, she didnt know if the woman would be nice or not, she was in knockturn alley. "Oh and Im Genevieve Rasmuse by the way. Im the Potions Professor at Hogwarts." Gen said this with a smile hoping that she would be friendly.