You mean when Bill tried taking over the world? Somehow I figured that.
[He learned enough about the apocalypse. He can't be too surprised to hear that Dipper would go to lengths to save Mabel.] ...but you're right. Trust me, I get it. I'd go through a ton of horrible stuff to protect my brother, too. And I'm gonna tell you the same thing I told Dipper the first time you disappeared. You guys will know the right thing to do when the time comes because you'll probably think about what he would do if he were here and what he'd say. You know what I mean?
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[He learned enough about the apocalypse. He can't be too surprised to hear that Dipper would go to lengths to save Mabel.] ...but you're right. Trust me, I get it. I'd go through a ton of horrible stuff to protect my brother, too. And I'm gonna tell you the same thing I told Dipper the first time you disappeared. You guys will know the right thing to do when the time comes because you'll probably think about what he would do if he were here and what he'd say. You know what I mean?