In the above example, if Darth Vader were to keep moving through squares adjacent to the Rebel Trooper, would the Trooper be able to make more attacks of opportunity?

No. A character makes only one attack of opportunity during a given character's turn. So even if your character moves all the way around an enemy to the other side (moving out of 4 adjacent squares), the enemy gets only a single attack of opportunity against it.

(If this movement provokes attacks of opportunity from different characters, of course, they each get to attack once.) Q: A player told me that a character can make only one attack of opportunity per round. Thus, you could sacrifice an inexpensive character to "use up" an enemy's attack of opportunity, allowing the next character to move by freely. But the attack of opportunity rules say a character can make one attack of opportunity per turn, not per round.

The other player says that turns and rounds are the same thing. Who is right? A: You are correct.

Turns and rounds are different. (See the Skirmish Basics section of the rulebook.) A character can make only one attack of opportunity per turn, but it can make any number of ... more.

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