- Player A's monster attacks player B's face down monster.
- Both players decided not to chain the attack while monster is still face down
- Monster is flipped face up, which is Kelbek
- Player A activates Quick-Play spell Forbidden Chalice on player B's Kelbek so its effect is negated.
Question: Is player A allowed to activate Quick-Play spell after the monster is flipped face up?
A monster that attacks this card returns to the hand. Damage calculation is applied normally.
Target 1 face-up monster on the field; until the end of this turn, that target gains 400 ATK, but its effects are negated.