A helpless foe-one who is bound, sleeping, unconscious, or otherwise at the attacker's mercy-is an easy target. A character can sometimes approach a target who is unaware of his or her presence, get adjacent to the target, and treat him or her as helpless. If the target is in combat
or some other tense situation, and therefore in a state of acute awareness and readiness, or if the target can use his or her Dexterity bonus to Defense
, then that target can't be considered unaware. Further, any reasonable precaution taken by a target, including stationing bodyguards, placing his or her back to a wall, or being able to make Spot checks, also precludes catching that target unaware and helpless.