Page "Duel (1971 film)" Paragraph 8
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Wikipedia
Mann leaves Chuck's Café and stops to help a stranded school bus, but his front bumper becomes caught underneath the rear of the bus.
Mann panics, manages to free the Plymouth and flees, but then is puzzled to see the truck helping the bus get moving.
At a railroad crossing, the truck quietly approaches Mann's car from behind and starts pushing the Valiant towards a passing freight train.
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2.310 seconds.