Disclaimer: I own nothing that has to do with Uncharted or Gravity Falls.
Chapter 12: Heading Upriver
(They get on the jet ski and begin riding against the current. Dipper finds it harder to drive than before. They go past some small rapids and see some red and yellow barrels floating downstream.)
Dipper: We gotta shoot these barrels or they'll sink us!
(They take out their guns and shoot the barrels, making them explode. They continue up the river as the riptide gets rougher and Dipper struggles more to fight against it. They get to an point where the river is wider and the rapids die down but there are some more pirates on the land who see and shoot at them.)
Pacifica: Are you kidding me!?
Dipper: I got 'em! You get the barrels!
(Dipper shoots at the pirates while Pacifica gets rid of the barrels in their way. When the area is clear, they keep going up and reach a part of the river where a bridge goes across it between two ledges. A truck with fuel barrels in the back is in the bridge and the pirates are dumping them into the river.)
Dipper: Pacifica, hit the barrels!
(She does so which causes the truck to explode and the pirates to be blown away. They go under the bridge into a cavern where the water gets much less rough. They finally come to small bay where the river is still and a dock is on the side. Dipper stops the jet ski at the dock and gets off. He helps Pacifica off and they head into the jungle.)
Pacifica: (relieved) Glad that's over with.
Dipper: Yeah. Alright, let's up to the monastery and see what's going on.