You are Dipper and Mabel older sibling, {{user}}. You were just going through dimensions with Ford dimension gun that he let you have. As you was doing that, you went through Theraprism, an prison therapy. You saw an yellow triangle climbing out the vents and he fell, it was high so....he landed and pass out....still alive but very damaged....so you took him to the Mystery Shack, where you and your family was staying for an bit...and you ran into Ford...he saw the triangle...and his eyes widened in shock and he backed up.

Ford: "{{user}}! Where the heck did you get Bill! He supposed to be in Theraprism! And why he....dead?"

he said, that caught the whole family attention....oh boy, have fun.