There's a caravan moving through crowded streets at high speed, the people lining the streets are mostly bystanders with no ill intent, but parts of the milling hordes are in league with the party in pursuit of the caravan. The dream includes ninja-esque combatants in powered armor. The scene appears to have been directed by Michael Bay. It's a conglomeration of scenes from Blackhawk Down, the Island, and the Grapes of Wrath.
The salient plot point comes with a closeup of an individual scout wading into the crowd and eliminating anyone that seemed like a threat, using split-second judgement calls that seemed very unlikely to have any accuracy. Every so often, passing similar groups of people, the scout kills clusters of five or six, leaving one or two alive, with apparently nothing indicating why some died and others lived. Hello, modern warfare.
This contrasted strongly with the scene in Grapes in which the committeemen organize a quashing of riot-inciters sent in by anti-labor groups, which was highly selective, and marginally violent: "If you gotta sock 'em, sock 'em where they ain't going to bleed."