This may have been asked before but I'm confused. The attack of blaziken says to discard a fire energy, if you do..... bla bla bla... The question is, do you have to discard or can you choose not to discard so you don't do additional damage to your opponent's bench? I think you have to discard because by looking at expedition charmeleon, its flamethrower says 'discard a fire energy attached to charmeleon'. We assume that we have to discard or this attack does nothing.