Sev | Lily
I wouldn't stupefy a sidewalk full of Muggles unless they were a danger to people.
It's not for the faint-hearted. One of the main characters is a cannibalistic serial killer. She is. She wishes to determine if potions can be brewed by someone non-magical or rather whether they can be altered to do so. It is an interesting project and she is becoming quite accustomed to exploding potions.