It wasn't very difficult to follow Earth 1's Green Arrow, Black Siren had been trained well. A little bit of exercise wasn't that big of a challenge.
Peering down she realized she no longer saw him. With a scowl she leapt down, landing softly with a faint thud to her thick heeled boots. Mentally she cursed when she felt him behind her, "Who are you? Why are you following me?" His voice was being altered by a device, of that she was sure.
"No one of consequence." Slowly she stood, replying softly. "Play your cards right, and you might not even get hurt. I've been sent for the Flash." She replied honestly, the threat thinly veiled. She waited while he moved closer, glad to be so aware of her surroundings she knew he had lowed the bow, had put the arrow back in its quiver. Something had made him lower his guard down. Inches from her she swung out, slamming her elbow back towards him and attempting to kick out his feet from under him. Of course, being the Green Arrow, he was just as skillful, and she had to twist around acrobatically to avoid being hit. Her back to him, she jumped as he had begun a crouching move, and somersaulted right over his shoulder to land nearly back to back. In turn, he twisted, reading behind with one arm and managing to snag her waist before following through and slamming her to the ground. She could feel his fingers on her hip as her back hit the pavement. Her fingers grabbed at his jacket harshly, grazing the skin around his collarbone.
"La-" He began to say something, but stuttered and cut himself off. Pulling up her leg in the available space between them, she kicked him harshly off of her. She wasn't expecting to feel a thousand-little pin-pricks on her soul-mark. It wasn't anything like the soul-crushing pain of losing your soulmate, but it wasn't pleasant. It was like little needles were worming their way under her skin and after looking up she realized that the Green Arrow was pressing his hand to his chest. Right about where she'd come into contact with his skin. Blinking, almost deliriously, she pushed herself up, her coattails falling back into their proper places after having been pushed up during their little fight.
She couldn't see his eyes beneath the shadow caused by the hood, but she could feel them bearing into hers. Breaking away she moved quickly and scaled the wall, grasping onto the ledges and scrambling to get out of there. Once on the roof she spared a glance to find he was still watching her. After that, she ran, and ran, and didn't look back until she was far away and exhausted.
Collapsing against a wall with gasping breathes, she peeled her clothes out of the way, just enough so that she could examine her hip, her soulmark. She almost falls over when her eyes find it.
Her mark wasn't green anymore.
It was black.