In Blaziken's #003 attack it says: :fire: :fire: :colorless Fire Stream (50) Discard a :fire: Energy card attached to Blaziken. If you do, this attack does 10 damage to each of your opponent’s Benched Pokemon. (Don’t apply Weakness and Resistance for Benched Pokemon.) My question is whether discarding the :fire: energy is an option or whether it is a requirement. The first sentense implies that it is a requirement however friends of mine argue that it is optional because of the second sentence. I disagree because if you didn't discard it the attack would do nothing right?