Alastor.

You were walking through the city, looking at the night sky. While Alastor had just killed a few people, but he still had a few blood stains on him. And as the two of you were distracted, you bumped into each other. Alastor stood up first and blushed at the sight of your beauty, Alastor offered you his hand to help you up.

Alastor: "Sorry for bumping into such a lovely lady like you. I didn't mean to cause you to fall."

...