Patsy is a military disguise skill that allows Alex Mercer to save himself by targeting any human for termination, accusing that the human is Zeus in disguise. The target can either be a military personnel or a civilian. Mercer was capable of doing this only when disguised as a military personnel (Marines or Blackwatch).
Patsy is an excellent way of reducing the alert status, when outside the range of a viral detector. The alerted military unit display hostility towards the human target and will open fire, eventually. This ability is further upgradeable and has a regeneration period of 20 seconds after each use. Tactically, this ability can be used to reduce the suspicion of any surrounding military personnel.