Oliver chases a shooter on a motorcycle but loses her in an alley in episode 1x07 "Muse of Fire".
Oliver says goodbye to Mari behind the police station in episode 4x15 "Taken".
A group of criminals run down an alley while firing into the air behind them in episode 4x15 "Taken".
Oliver and his father are attacked after their final fitting and are saved by a mysterious hooded figure in episode 5x08 "Invasion!".
Oliver chases Tina Boland down the alley behind her apartment but is thwarted when she leaves the range of the power dampener in episode 5x11 "Second Chances".
Source: What's Filming — Twitter