If you are Striding, and you trigger an attack of opportunity from an enemy wielding a flail, the flail's critical specialization can cause you to fall prone. If this happens, is your Stride action disrupted?

The prone condition says the only move actions you can take while prone are crawl and stand, but it's not clear how that rule is enforced when you're halfway through a Stride action that you originally met the prerequisites for.

  • \$\begingroup\$ @cpcodes: Please refrain from answering in comments (even partially).. If you think you know the answer, you should leave it as an actual answer, not as a comment. \$\endgroup\$ – V2Blast Oct 2 at 9:05
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    \$\begingroup\$ @cpcodes "This can't be answered" (or, if you prefer, "the rules are unclear") is an answer \$\endgroup\$ – Delioth Oct 7 at 14:26
  • \$\begingroup\$ @Delioth: Correct. "The rules don't address this" is still an answer (just as "It's up to the DM" is). cpcodes, if you have further questions about this, feel free to ask on Role-playing Games Meta. \$\endgroup\$ – V2Blast Oct 11 at 3:38

In short, the target would be prone in the space they moved to and not be able to move any further, effectively ending the Stride action.

From the PF2 SRD (emphasis mine)

Some reactions and free actions are triggered by a creature using an action with the move trait. The most notable example is Attack of Opportunity. Actions with the move trait can trigger reactions or free actions throughout the course of the distance traveled. Each time you exit a square (or move 5 feet if not using a grid) within a creature’s reach, your movement triggers those reactions and free actions (although no more than once per move action for a given reacting creature). If you use a move action but don’t move out of a square, the trigger instead happens at the end of that action or ability.

So, firstly, it's clear from this rule that the trigger occurs after exiting the square moved from, meaning the provoking character will fall prone in the square moved to (note that this is different to 1st edition PF).

Next from the rules for the Prone condition.

The only move actions you can use while you’re prone are Crawl and Stand.

So, even though the target is in the middle of a Stride action, being Prone is now preventing them from using this action. Therefore, the action ends. The target could now use a new action to Crawl or Stand, assuming they have any actions remaining.

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    \$\begingroup\$ Also supporting your answer the stride action states that "You move up to your Speed." Which indicates that the stide can end before all of the available movement is used. \$\endgroup\$ – Ruse Oct 7 at 21:27

I do not think the rules are directly explicit on this matter.

However, I would rule that the creature would fall prone in the square they were moving into when the attack was triggered, or in their current square if not moving, and would cease striding having spent the action. I feel this is more similar to how it would work in reality* - we don't get tripped, walk another 20 feet, then fall over. Nothing about the stride action requires that you move your full distance.

This would work much like a critical attack of opportunity, or a readied attack that successfully grapples or disarms (with a flat check on grapple), which can interrupt spells mid-cast, with the target having spent their actions.

*Of course, in reality, if you were running and where tripped inertia would likely result in you flying a short distance in the direction you were moving when the trip occurred - however this would not be a continuation of your 'stride', as you would have relatively little control over the direction moved.


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