The first time it happened, it was with Roy.
There was nothing particularly different with this crime. It was just your average bank break in with some regular criminals. But, something about it made it a little trickier. It may have been how tired or on edge everyone was. But, I guess we will never know.
Everything was going according to plan. Even more so than they thought it would. In fact, they were down to their last two standing. Roy and Oliver, or shall I say Arsenal and Arrow took them down quick enough. Roy took a small breather as Oliver started walking towards him. "Behind you!" Roy turned around as Oliver readier his bow. One of the criminals had gotten up and was running straight at him with a gun. Then, it happened
An arrow shot through the air behind Roy and dug its self in the man. Roy stared at it in shock as Oliver looked to where the arrow came from. He saw a figure in all black hiding in the air vent before she disappeared. Not feeling that she's dangerous, Oliver let her go and ran to Roy. "Are you alright?" Roy nodded, as he was still stunned.
Team Arrow had seen her multiple times after that. She always showed up when one of them was in danger and always saved their backs. She even had gotten a small amount of publicity, as she had saved detective Lance and Laurel once or twice. The city had dubbed her the Shadow, seeing as she was never seen or heard and no one knew who she was. Felicity had tried to find out who she could be, under Oliver's orders, only to come up blank. They only thing they had to go on, was the fact that their savior was a female after Roy caught her hair flying behind her as she ran off.
But, they were lucky they had her watching over them. Without her, one or more members of the team would have been gone by now. Although they didn't know who she was, most of them counted her to be a member of their team.