The male victim was eastbound on Interstate 580 driving a Volkswagen Jetta in the center lane, when Cangiamilla, driving a Jeep, began to pass victim from the fast lane, according to a police report.
The victim spotted traffic ahead and moved into the passing lane ahead of Cangiamilla's Jeep, which dodged the traffic by moving right. After that, the report said, the Jeep moved back in front of the victim's car, swerving back and forth between lanes to prevent the victim from passing.
When the Jeep exited onto Santa Rita Road, the victim followed with the intent of talking to the Jeep's driver, the report said.
When the two vehicles were stopped at the light at the intersection of Main Street and Stanley Boulevard, the victim got out of his car to approach Cangiamilla, who got out of his Jeep and drew a sword from a cane scabbard.
The victim retreated to his car, and Cangiamilla approached, holding the sword above his waist, yelling and aggravated, according to the report, which said he slammed the tip of the sword "as hard as he could" into the victim's door.
Cangiamilla then went back to his Jeep and turned into the parking lot on Main and Stanley, followed by the victim, who was attempting to read Cangiamilla's license plate. Cangiamilla approached the car again and tried to open the driver's door, then kicked it, as the victim, who'd called 911, drove by reading the license plate to a Pleasanton dispatcher.
The victim followed Cangiamilla back onto Stanley, but stopped following after the Jeep made a u-turn.
An officer was sent to Cangiamilla's home, where he was arrested without incident and the cane sword was seized at the home.
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