Both he and the witness detained one of the suspects, 37-year-old Charles Tatum of Ventura until police arrived. The second suspect took off and remains on the run. He was vaguely described as a white man in his 40s, 5 feet 8 inches tall and weighing about 190 pounds.
The victim was not injured and his wallet was recovered.
Tatum was booked into Ventura County jail on robbery charges.