One thing you had to give the particular thugs that Dinah had just watched The Spoiler take down, was that the thugs were all nice and colour coordinated. That was all that she was willing to give them (besides a punch maybe, but Spoiler had gone and taken care of that rather nicely). Now speaking as someone who had once donned a costume and gone out against the very explicit wishes of her mother, Dinah knew a thing or two about fibbing about your night time activities.
(Although really -- her mother hadn't bought any of her stories, and as soon as word got out that the Black Canary was back in action her mother knew who had taken her name.)
"Epic paper cut." Dinah suggested, taking a step out of the shadows. She had come across the fight at the end, otherwise she would have made her presence known before now. Probably. Really the younger crime fighter had seemed to have things in hand.