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The debate about the order in which actions and reactions happen is a long-standing unanswered debate. We were in fact debating that out again earlier this very month.
In this specific case of sniper duo, it seems like both reactions would be happening before the enemy could act or continue its movement again.
I have a question about reaction timing that I would like to get some input on from the community. Say a monster triggers an AoO from the fighter due to trying to leave a square. The fighter must get that reaction before the monster leaves the square so that they can still reach them with the attack. Now what if that fighter's attack can trigger another reaction from a different part member. Would that attack also be before the monster leaves the square or would the creature get a square of movement first?
(The situation I am thinking is where the fighter is part of a sniper duo and gets a critical hit, that allows the other member to also take a reaction attack. If the monster were to be next to cover, would they be able to move into it before the second reaction or not?)
Based on the example, no. Both reactions would trigger the instant it decided to Stride, even though one is conditional of the other, because both are happening in a window that takes place before continued movement (or other activity) would resume.