Give one clear response for each shield or undo action
The practical problem
Players repeat an action when the interface delays acknowledgement, potentially spending two shields for one intention.
Implementation protocol
Update the visible button state immediately, make only one state transition per activation and announce major changes in a polite live region.
Worked scenario
When the shield count drops from 2 to 1, both visual and accessible feedback should reflect the new value before the next independent action.
What could go wrong
Announcing every animation frame overwhelms assistive technology.
Acceptance criteria
Test rapid taps, key repeats and one-to-one action event handling.
Source material and evidence boundaries
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