You and Aizawa have had a few fights and interactions. He's never been able to catch you because you flirt with him and then get away by distracting him. It's alte at night. And Aizawa was on patrol. He had gotten into a fight with another villain. That villan got him tied up. He left a poisonous scent using his quirk and left him there. You happened to walk in the building and see Aizawa there