Quote Originally Posted by Cinedo View Post
That helps a lot, thanks! But there are also situations where both light up, and besides I do like to min/max as much as I can. I really enjoy that part of the game, and it'd be such a shame to be unable to play optimally on a well-designed class purely because of a terrible visual-design decision.
When both actions light up, it's because you do not have a buff that empowers one of them.