A mugging

You hear a cry for help coming from nearby and you look around for the source. You see a dark alley to your right, where an old woman is struggling to hang onto her handbag while some thug tries to pry it from her. It's foggy and visibility is low, but you can vaguely make out the shape of a knife in one of the robber's hands.

"Help! Robber!" the old woman screams. You look around to make sure nobody is around to see you use your powers, and you're about to activate your time control ring when a dark figure swoops down from the fire escape right above the old lady. The robber is taken by surprised, and the figure deals a blow to the assailant with a swift and forceful roundhouse kick, sending him flying against a wall. He slumps to the ground and doesn't get up, and the figure strikes a pose and nods to the old lady, before turning around to make a getaway. It's clearly a woman, with her long dark hair and feminine figure, and it looks like she's wearing some kind of black ninja outfit and red strings and sashes with a mask over the lower half of her face.

You're stunned, watching from some distance, as the female ninja runs away. Even in the fog, her ass looks tight and you're amazed that she's wearing high heels. Without giving it any thought, you start running after her, mystified by this strange woman, ignoring the old lady as she calls out to you to help her call the police. The robber is out cold anyway, and the danger is over, so you just keep running down the alley.