Which step gives an Opportunity Attack?

Three independent examples with one-Space melee reach. The shaded Spaces are within this enemy’s reach; use the actual weapon’s reach and obstructions in play.

1. Entering reach goes from an outside Space to an inside Space. It does not trigger this Opportunity Attack.
2. Moving between two different Spaces both within reach can trigger an Opportunity Attack. Complete and pay for the step first.
3. At the new position, the enemy must perceive the mover, have a legal Melee attack and pay its cost. Resolve that Exchange before the next movement step.
4. Leaving reach goes from inside to outside. It does not trigger this Opportunity Attack.

Result: Only the middle, inside-to-inside step can trigger the attack. Entering or leaving reach cannot.

• The mover may choose a legal Exchange Response. The Reaction grants no Activation, uses no proactive Melee use and does not automatically stop remaining movement.
• Use actual reach and barriers. Forced movement follows the same trigger unless a specific rule prevents Reactions. Multiple opponents recheck legality before each attack.
• In Story and Cinematic Modes, agree the same inside-to-inside positions. There is no fixed facing or rear blind spot here.