Edison format ruling
Ready for Intercepting

Card effect (current official text)Target 1 Warrior or Spellcaster monster on the field; change that target to face-down Defense Position.
Rulings
- If you activate Ready for Intercepting after your opponent’s attack declaration to flip face-down the monster which is being attacked, a replay does not occur. Complete the attack as normal. (This must happen during the Battle Step, not the Damage Step.)
- If you activate Ready for Intercepting and target the attacking monster, it is flipped into face-down Defense Position and the attack ends. (This must happen during the Battle Step, not the Damage Step.)
- While the effect of Light of Intervention is active, you cannot activate Ready for Intercepting.
- If you chain Ready for Intercepting to Hammer Shot to flip a monster face-down, that monster will not be included in determining which monster is destroyed by the effect of Hammer Shot.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.