(In order to avoid clutter, we can play multiple scenarios at once that will run concurrently. You may only be in one scenario at a time. If you wish to join another, have your character leave that scenario. Please think of realistic ways to be involved in a scenario. Now that that's over, have fun!)
In the midst of dark, dank alleyways and flickering lamplights, the man skuled around the corner stealthily and leapt up onto a rusting, metal dumpster. With nimble agility, he hoisted himself up onto the rooftop adjacent and crawled over it silently, his eyes sweeping the surroundings until they latched onto his prey.
Slim. Tall. And, oddly enough, donning a motorcycle helmet with a black, mirrored glass vizor. From his vantage point, he could see the grimy tarmac reflected on her headwear. He gripped the edge of the rooftop with both fingers and flattened himself against the corrugated metal, hardly daring to breathe. From this clandestine position, he was virtually invisible to all and completely invisible to one who had already obfuscated their sensory capacity with that ostensibly gaudy helmet.
The girl passed beneath him.
With unerring timing and precision, he launched himself off the rooftop and landed directly behind her on the tips of his toes. Raising his right hand into the air, he conjured an extension of his arm; a thick, baseball bat composed of a dark blue shade of ice.
"Pssst."
Before the girl could fully turn around, the man cracked the bat against her helmet and watched her crumple to the floor.