Instruct the mortal to CONCEAL information?  CONCEALING information usually makes situations MORE COMPLICATED because then agents have DIFFERENT PICTURES of what is HAPPENING and their actions do not conduce to ANY coherent strategy or goal, even those goals that even most mortals usually share, such as NOT DESTROYING REALITY.

Instruct the mortal to CONCEAL information?  CONCEALING information usually makes situations MORE COMPLICATED because then agents have DIFFERENT PICTURES of what is HAPPENING and their actions do not conduce to ANY coherent strategy or goal, even those goals that most mortals usually share, such as NOT DESTROYING REALITY.