Emblom said it was fear of what Hammer might do that led to him to build a fire and help Hammer load the five paint buckets and dog cage onto his friend's truck.
"What do you tell someone who had just killed someone and cut them up," Emblom said.
Emblom and another of Hammer's longtime friends, Brian Mathis, testified to previously hearing.
Hammer's girlfriend Amber talk about Duran, her former husband, the physical abuse she claimed to have endured from him and the battle for custody of their young child. Both claimed this happened a number of times and each time it got Hammer very angry at Duran.
During a July 4th gathering last year Emblom said he overheard Hammer make the threat to shoot Duran while laying out his own self-defense for the act.
"He said he would call the cops and say that he shot the guy because he tried to force his way in," Emblom said.
After Duran's death Emblom contacted authorities to report his experience with Hammer.