Huh? But what happens with cards that prevent or reduce the damage? They don't check the final damage to effect the calculation?
Reduction Barrier [511000417] also doesn't count possible bonus ATK? And Spell of Pain [511001785] and Rainbow Life [34002992]? Return Damage [511000955] is in the same Gimmick Box's boat.
Nope, I guess not. That's why such a situation like below would happen, there's nothing we could do about it as of now.
1. Player A gains an Effect A that halves all battle damage this turn.
2. Monster A can inflict battle damage to both players.
3. Let's say Monster A can inflict 3000 damage.
4. Player A because of Effect A takes 1500 damage while Player B still takes 3000 damage.