After all of the small room had been checked for the amulet, Wendy suggested that they head through the door that Bill had disappeared through.
"Who knows? Maybe Bill already found it?" She said.
Dipper nodded, but he still had a blank look on his face. Wendy took him by the hand to lead him along. She knew he was shocked, but that couldn't stop them from retrieving the amulet.
They stepped through the door and onto a platform that overlooked the river rushing below them. A catwalk connected the platform which they stood on to a platform on the opposite end of the bunker.
Wendy looked down. The river was running through turbines and rushing out a shaft.
"This must be the Gravity Falls dam!" Mabel gasped.
"Dudes this is awesome!" Soos whispered excitedly.
Even Dipper had a look of awe on his face.
They gazed down at the rushing water for a moment longer, and then began to cross the catwalk.
They were almost to the other side when a white haired figure approached them from the opposite platform, a glowing white stone in his hand. The group stopped.
"Not so fast." Gideon growled. "Did you really think I didn't know how to get here? I've been planning this for months-"
And before he could say another word, Dipper leaped forward and punched him in the face. The scuffle only lasted a few minutes though, as Gideon used the amulet to levitate Dipper several feet above the catwalk.
"Dipper!" Wendy cried, aghast.
"Wendy!" Dipper called back frantically. "Run!"
Gideon cackled.
"If any of you move, I'll drop him over the edge!" He threatened. "Now, if you'll excuse me, I have a portal to locate and use. Behold my power!"
Gideon dropped Dipper onto the catwalk and Wendy and Mabel rushed over to him. Gideon then blasted a hole in the wall, and blasted the turbines. The bunker began to shake as the dam began to fail. Gideon continued to laugh as he rose above the scene.
Suddenly Bill came sprinting down the catwalk and leaped onto Gideon. The two collapsed back down onto the catwalk which was now swaying and creaking.
They watched in shock as Bill tore the amulet from Gideon's hand and began to rise up above them, laughing.
His form began to morph back into his triangular shape.
"Ohh it is good to be back!" The omnipresent triangle cackled.
Bill closed his eye and his powers, along with all his memories, can rushing back.
He knew the power he held was only for the full moon, and as long as he held the amulet, but he was going to take full advantage of it while he had it.
"You!" He yelled down to Gideon.
He zoomed down to Gideon and prepared to zap him with a laser, but he hesitated. No. He needed to choose something that would not be destructive. The dam was coming down around them, the exit was blocked, and his newfound friends would need to be able to escape.
Well then. Bill thought. Time for Plan B.
He charged down at Gideon and overshadowed him. The then proceeded to rise up, and punch himself in the face repeatedly.
Pinetree looked confused.
"Bill?" Pinetree said. "You're still helping us?"
"What does it look like I'm doing?!" Bill grumbled. "Find a way out! I'll take care of Gideon!"
But it was too late. There was a loud rumbling sound as the dam burst around them...