Sierra Vista Fire & Medical Services will team up with agencies and hospitals from throughout the region to conduct a full-scale hazmat exercise beginning at 8 a.m. in the Mall at Sierra Vista on Wednesday, Oct. 18. The simulation will begin inside a theater prior to the mall’s operating hours. It will involve an actor throwing handfuls of white powder onto fellow moviegoers, who are all players in the exercise, before running out of an emergency exit. The exercise will then test the capabilities of mall security, area hazardous materials teams, and hospitals to coordinate an effective response.