A driver captured the footage on a dashboard camera shortly after a cash-handler was robbed in Newton Heath, Manchester.
The robber threatened to blind the handler with a squeezable bottle of liquid before snatching cash and riding off on a motorcycle with another man.
Officers later found a box of cash and a burned-out motorcycle.
Greater Manchester Police have released the footage along with CCTV in a bid to find the suspect.
The robbery happened on the afternoon of 18 January in Old Church Street.
Bags filled with cash and a deposit box were taken, before the men fled on a Yamaha R6 motorcycle, later found set alight.
About 20 minutes later, in Mossley, a driver noticed two men running across some fields, one carrying bags filled with cash.
Det Con Phil Caine said: "The nature of this incident is truly shocking and we need to make sure those responsible are off our streets, unable to cause any more harm."
An alleged thief was filmed running across a field carrying bags of cash after a security van robbery.