If you attack with Blue Ahri (or similar attacker with a trigger), play and resolve a reaction during showdown, then announce you want to resolve Ahri's effect targeting the single defender, is this a missed trigger or an acceptable shortcut?

Ruling: This is technically a missed trigger because the effect was not announced and declared when it went on the chain. If you ask about it after the fact, it is up to your opponent whether to allow it to resolve.

Nuances:

• Some judges require all triggers to be declared verbally at events
• In casual play with an obvious single target and no special abilities like deathknell involved, many players might assume the might reduction and allow it
• It is not recommended to make this a shortcut in competitive play