Gustov ‘Bud’ Clark, prosecution expert witness in the death of Francisco Javier Dominguez, testified on how Border Patrol Agent Nicholas Corbett could have shot and killed the 22-year-old Mexican national. The law enforcement expert witness told jurors in federal court Friday about ‘sympathetic squeeze.’ The Arizona Department of Public Safety expert said it means if a gun is held in one hand, and the other grabs something, you’ll likely pull the trigger, as a reflex. Clark told jurors that in video training sessions with Border Patrol agents, when a scenario is presented where a suspected illegal entrant is holding a rock, the agents are trained to back up but nothing in the surveillance video indicates that Corbett backed away from Dominguez.