Oliver chases a Vertigo dealer in order to identify his supplier in episode 1x12 "Vertigo".
Laurel and Roy attempt to ambush Brick but end up getting one of the aldermen killed in episode 3x11 "Midnight City".
A woman under attack in an alley is saved my Laurel as Black Canary who is in turn saved by Roy as Arsenal in episode 3x11 "Midnight City".
Oliver and Tatsu go to the port to save Maseo and Akio in episode 3x07 "Draw Back Your Bow".
The team heads into the building from the GPS and locate the hideout of the corrupt police officers in episode 4x04 "Beyond Redemption".
Raimy and the police search the old factory for signs of where Eva was held in episode 1x04 "Bleed Over".
Jimmy takes Grace to the docks to kill the man he suspects is the mole in episode #101 "The Aquarium".
From episode #101 "The Aquarium".