If the action fails, modifiers and reactions that can be used at the end/after an action can still be used afterwards (after combat, if any).
Fail an Action
27 cards
Rulings
If the action fails, the action has reached resolution, so is subject to NRA (Non Repeatable Action) rules.
If an action fails, it was not blocked. Cards/effects depending on a block (e.g. Mirror Image, Freak Drive) cannot be played/used.