Leonard and Ty
Leonard was familiar with Oliver Queen thanks in part to his knowing Barry Allen as well as Sara Lance. Mia, however, was after his time. He was unfamiliar with Oliver's daughter and so when Tyrone spoke of Mia, he had no idea who he was talking about.
"I am afraid I am not familiar with Mia," Leonard replied simply. "But I am used to kids who look have your age fighting." Where Leonard grew up, children fighting wasn't exactly uncommon and once you hit Juvie, that was all you experienced. If it hadn't been for Mick, Leonard's life would have ended in Juvie at the age of fourteen after all.
"It wasn't a commonplace, but when you're less fortunate you find yourself in situations where fighting is your only option, no matter how old you happen to be." Though Leonard was surprised there wasn't an age restriction on this event. The girl was young even if she fought like a seasoned veteran.