第四教 · Dai Yonkyo
Sukui Nage 掬投
Scooping Throw
Mechanic
Tori dives their arms below uke's hips or thighs and scoops upward, lifting uke's base clean off the floor so the top-heavy body tips over backward with nothing left under it.
Analogy
A forklift slides two flat forks under the very bottom of a tall stack of crates and lifts. The bottom of the tower leaves the ground, the top has nowhere to go but backward, and the whole stack tips away from the machine and comes down.
Why it maps
The forks under the base are tori's arms scooping under the hips: lift the foundation off the floor and the top-heavy body above it has nothing to stand on and topples backward.