So Newt doesn't realize how bad the muggle-wizard tensions are in New York. After getting off the boat he ends up in the bad side of town. The assailants can be muggles no maj's who figure out he's a wizard, or wizards angry that he's a muggle sympathizer, or maybe some guys who just want a piece of that british ass, smut is smut and i'm not picky ¯\_(ツ)_/¯