The Hirsch Phenomenon (part 34)

The group quickly got to work trying to put together the chocolaty puzzle. Working together, it hadn't taken too long to put all the pieces together.
It was a statue. Not just any statue, but Nathaniel Northwest's statue.
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The group had sprinted to the statue, completely out of breath once they got there. They collapsed at the base of the statue. Once they had caught their breath, they looked up at the statue.
Alex almost immediately noticed the triangular hole on the statue's plaque.
"The keystone! It fits perfectly!" He exclaimed. He motioned for Mirra to hand him the keystone. She gave it to him and backed away as he approached the statue. By the time Alex placed the keystone in the hole, Mirra was almost 30 feet behind him. Alex turned around.
"Why are you standing all the way over there?" He asked. "Don't you want to go home?" Just then he noticed her terrified expression. A tremor shook the ground, strong enough that Alex lost his balance and had to grab the statue to avoid falling. The sky darkened. Mirra continued backing up but yelped as she hit an invisible barrier.
The sky continued to darken and the group's surroundings grew black and white.
"Guuuuys?" Mirra crowed. She stood with her back still pressed upon the barrier, eyes fixed on something invisible a few feet above the top of the statue. The wind picked up.
Suddenly the invisible wall she was pressed against became visible as it glowed with a blue light. Everything on the other side of the wall vanished. Mirra quickly backed away from the wall as blue tongues of fire snaked along the ground.
Suddenly a deep cackle could be heard. Alex was almost certain it was Entropy until the laughter got higher and higher pitched. The laugh was unmistakeable and definitely NOT Entropy's.
Suddenly a black vortex appeared and swallowed them into darkness.
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Alex groaned. He gradually sat up and waited for his eyes to adjust to his surroundings. The floor was cold and stony. Wherever he was, it was very dark, except for a few lights flickering about 20 feet away from where he stood. A voice came from somewhere. It was raspy, and it sounded like a combination between John F. Kennedy and a Dalek.
"Baaal Saifuh. Do not break your proh-mise!"
"Relax, Phoebus. I got it all here, safe and sound."
It was Bill.
Alex tried to get a better look at his surroundings. He was able to see the forms of three other people around them. It was Mirra and the twins, Alex was sure of it. One of the smaller forms began to move, and moved closer to Alex. As Alex's eyes began to adjust, he could make out the pine tree on the form's hat. It was Dipper. One of the lights in the room flickered and moved.
"There ya go." Bill said to whatever he was talking to, this 'Phoebus'. Almost as soon as he said that, Mirra gasped and sat up, as if she had awoken from a bad dream. She groaned and stood up.
"What's going on?" she asked drowsily. Two of the lights turned off, leaving only a single yellow one. A triangular yellow one.