Prone
You lie on the ground, taking a −2 circumstance penalty to your own attack rolls while melee attackers gain +1 to hit you and ranged attackers take −2. You are Off-Guard against me...
You are lying on the ground. You take a −2 circumstance penalty to attack rolls. Melee attackers gain a +1 circumstance bonus to hit you; ranged attackers take a −2 penalty. Standing up costs one action.
You're Off-Guard against melee attackers while Prone, but not against ranged attackers. If you're Prone and Immobilized, you can't Stand Up — plan accordingly.
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