Can The battle master maneuver Precision Attack be used after his enemy casts the shield spell as a reaction to the battle master's initial die roll? This happened during a game. It didn't occur to me till after that it might not be possible.
[RPG] Can a Precision Attack be added to an attack roll after an enethe uses Shield as a reaction to that attack roll
combat-maneuverdnd-5efighterspells
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Best Answer
You can add it after the roll, but not after someone else uses a reaction to respond to the result of the roll (i.e., because the roll indicated a hit and that result was declared):
The attack's success causing someone else to choose to expend a spell slot and their reaction is definitely an “effect of the attack” being applied.
It sounds though like this might have happened when another player simply saw your die roll, rather than after a final roll result was declared.
If your opponent is casting shield because they directly observed your die roll and didn't wait for you to declare the final result, that's a bit messy but it's entirely possible to untangle it, and fairly to everyone involved: say you weren't done, apply the superiority die, and then the opponent can choose to (or not) react with shield.
Of course, if they react with shield after you've declared that your final roll is a specific number and it hits, then you've committed yourself and that kind of “rolling back” the action declarations and resolutions would likely only happen if everyone was feeling generous.