Rufus hesitates for a moment but he knows what she says is true about mako energy. He's not about to admit to her that while he was funding Avalanche a lot of his motivation was just to see his father murdered out of his own hatred before thinking about what he would actually do once he took the throne.

But being caught and faced with either disappearing or being exiled under house arrest made him realize that he had to have a clear goal of what he needed to do and why. And if he was going to be pulling her into this, he definitely had to know.

"I do know. My first thing will be to get rid of Hojo and the things that he and my father are doing. And yes, mako energy will have to end."

He's realistic enough to see that it's not sustainable for many reasons. That's something that can't be avoided.