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Message: <blockquote data-quote="MeMeMeMe" data-source="post: 4272492" data-attributes="member: 68069">Let's say that's true (but see next paragraph): the character moves into the square and triggers the opportunity attack. He gets hit, and stops. At this point he has moved into the square - so isn't held back the way this build is dependent on.But he isn't actually stopped. The fighters class feature Combat Challenge is triggered "when a marked enemy that is adjacent to you shifts or makes an attack that does not include you, you can make a melee basic attack against that enemy as an immediate interrupt."This is an immediate interrupt, and it's this which is being relied upon to stop the movement. But this ability isn't being used: the polearm glaive (a) isn't an immediate interrupt, and (B) isn't triggered by a shift or an attack against someone else.So, the movement isn't stopped.A more general point about the immediate interrupt gained from combat challenge. This says, "If an interrupt invalidates a triggering action, that action is lost." So, you have to stop the person from being able to move, to cause him to stop moving. If the attack you made knocked him prone, that would work. But otherwise, the fighter makes his immediate interrupt attack, and then the target moves on. But note again that the fighter's combat challenge ability does not apply against move actions. It does work against shifts, but it doesn't stop the shift occurring.The marked target knows that if he does shift away, he will get attacked - but he can shift away anyway, if he chooses to. It's a deterrent, not a block.<snip>As noted above, this isn't right. There are several reasons above why this tactic doesn't work, but the most important one is the first one: polearm gambit is an opportunity action, and not an immediate action.There are two types of actions you can take after a trigger: Opportunity Actions, and Immediate Actions.There are also two types of Immediate Actions - Reactions and Interrupts. But an Opportunity Attack is neither, it is an opportunity action.</blockquote>

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