SenseTarget’s control or Perception roll.
AlterVery Easy against a person or animal that has no reason to mistrust you, or who wants something from you (an eager salesman, for example); Easy against a person or an animal who is neutral or indifferent to you; Moderate against a wild animal, or a person who has a societal reason to dislike you (i.e., prejudice); Difficult against a hungry predator, or a person who has a personal reason to dislike or hate you; Very Difficult against a person who is a sworn enemy, or an animal who is starving, angry, or wounded