Visible crew/equipment: Just after Luther accuses the Warriors of killing Cyrus, and Cleon is killed, there is a panning shot of all the gangs escaping and at the very right edge of the screen you can see a camera and its operator filming. (00:14:34)
Visible crew/equipment: The first time we see the Riffs leader address the Riff soldiers, when he says "who are The Warriors?" you can see the boom microphone reflected in his sunglasses. (00:19:28)
Visible crew/equipment: When The Warriors are running down the centre of the street (heading to the train station) as they are chased by the Turnbull AC's in their bus, on the left of this shot you can briefly see two crew members wearing yellow jackets standing next to some lighting equipment for the scene. (00:24:47)
Visible crew/equipment: When the leader of the Riffs' finds out it wasn't the Warriors who killed Cyrus there is a focused shot on his face and his sunglasses reflect a crewmember wearing a white T-shirt next to what looks like a camera. It has to be a crewmember as no-one in that scene is wearing a white T-shirt. (01:14:02)
Visible crew/equipment: In the scene right before the Warriors do battle with the Punks, they meet on the landing, and when they are about to go off you can see a blue sneaker and pant leg next to the pillar on the right side.
Answer: The Riffs were informed of the Warriors' innocence of wrongdoing by a member of another gang who had no reason to lie on behalf of the Warriors or to frame Luther (the actual culprit). Apparently Luther had a reputation for dishonesty, among other things, whereas the Warriors were considered to be among the city's more "honorable" gangs.
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