A Promise Guard can use Attack of Opportunity when a creature within her reach uses a concentrate action, in addition to its normal trigger. They can disrupt triggering concentrate actions, and they disrupt actions on any hit, not just a critical hit.
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Attack of Opportunity (Special)

A promise guard always has her shield raised as if they had used the Raise a Shield action, as long as they meet that action&#x27;s requirements.

Promise Guard Stance

Shield Block

A Promise guard can use their Shield Block reaction to prevent damage to an adjacent ally.

Shield Warden

The Promise guard makes a Strike with their longsword, then attempts to push the target back. If the Strike hits, the target is <a href="/condition/off-guard">Off Guard</a> until the start of the guard&#x27;s next turn, and the guard can automatically Shove the target, with the same benefits as the Shove action (including the critical success effect if the Strike was a critical hit). If the guard moves to follow the target, this movement doesn&#x27;t trigger reactions. In addition, if the target has to stop moving because it would hit an object, it takes damage equal to the guard&#x27;s Strength modifier.

Shield Shove

The Promise guard Strides up to double their Speed. If the guard ends their movement within melee reach of at least one enemy, they can make a melee Strike against that enemy.

Sudden Charge

A Promise Guard can use Attack of Opportunity when a creature within her reach uses a concentrate action, in addition to its normal trigger. They can disrupt triggering concentrate actions, and they disrupt actions on any hit, not just a critical hit.
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@Localize[PF2E.NPC.Abilities.Glossary.AttackOfOpportunity]

A promise guard always has her shield raised as if they had used the Raise a Shield action, as long as they meet that action's requirements.

@Localize[PF2E.NPC.Abilities.Glossary.ShieldBlock]

The Promise guard makes a Strike with their longsword, then attempts to push the target back. If the Strike hits, the target is @UUID[Compendium.pf2e.conditionitems.Item.Off-Guard] until the start of the guard's next turn, and the guard can automatically Shove the target, with the same benefits as the Shove action (including the critical success effect if the Strike was a critical hit). If the guard moves to follow the target, this movement doesn't trigger reactions. In addition, if the target has to stop moving because it would hit an object, it takes damage equal to the guard's Strength modifier.