“And that is why, for this mission,—” *Dipper sweeps hands out to Grandpas A and B* “—I brought TWO GRANDFATHERS!” *Bill Cipher raises finger, picks off Grandpa A. Dipper, Mabel, and Grandpa B watch him fall overboard into the dreamscape.
“…One grandfather. We now have…one grandfather.”
SOOS “wait you want us to throw the grandpas overboard? *chucks Grandpa B into the portal*”