Salarians have always operated at the very cutting edge of technology, believing that anything less is a waste of their capabilities. The salarians who have chosen to become outlaws are no less exacting. Preferring to operate on the sidelines rather than leading an assault, they often deploy holographic decoys.
While the decoy cannot damage an enemy, its kinetic barrier generator means that enemy targeting computers will register an impact when it's shot. This forces enemies to divide their attention and allows the salarian agent to flank or escape. APEX has attempted to research these decoys for larger scale deployment against the kett, but have been unable to create a convincing thermal signature. Meanwhile, it can be expected that these salarian agents will continue to refine their work.