We had a disagreement this evening in our 4e game. We had 2 4-square enemies attacking 1 player. 1 of the enemies moved partially through the other to charge the player. He first occupied a square adjacent to the player at the same time that he was moving through a square the other 4-square enemy occupied. So, he moved a further square. At that point, he was adjacent to the player, and moved 1 more square. We believed that he provoked an attack of opportunity. The gm disagreed. He at first argued that leaving an adjacent square doesn't provoke an opportunity attack if you remain adjacent. We disagreed most fervently, quoting the rule from the book, saying that "leaving a square adjacent to the target" does not state anything about where you end up. The gm continued the disagree, because the creature was unable to stop at the point when he was first adjacent to the player. We again disagreed. We resolved the conflict with him saying that there was no opportunity attack in this situation, but he would let our interpretation of the rule stand. I wanted to confirm that we were understanding it correctly...If you are adjacent to an enemy, moving (not shifting) to another square adjacent to it *does* provoke an attack of opportunity, correct?