The undersized sumo wrestler is Takanoyama, and he’s amazing. He executes the cleanest throws I’ve ever seen in sumo, which usually features two fat guys hitting each other head on, until one shoves the other out of the ring. The thinking in sumo is the bigger (i.e., fatter) you are, the better fighter you’ll be.
Takanoyama can’t rely on sheer mass to bull his opponents out of the ring, so he relies on skill. First of all, check out the sequence at 1:30, which is a thing of beauty. This is typical of his technique: he avoids the opponent’s charge by "getting off the tracks" and applying a 2-on-1. He actually moves behind his opponent, grabs his chin and belt, then dumps him.
Watch him apply the 2-on-1 as a throw at 2:10.
At 1:00 he applies a whizzer, which is a classic wrestling move to the outside against a charging opponent.
He continually angles off, both to the left and the right, but when he’s trapped and about to be overpowered, he suddenly reverses with a sacrifice technique, as seen at 2:58 and 4:17.
4:38 –Watch him move offline, sidestepping the charging bull, and using the opponent’s momentum to throw him. Beautiful.
Anytime the opponent’s stance is too wide he seizes the opportunity for an inner reaping throw.
Despite the exotic trappings of sumo, the techniques here are valid on the street: move offline, get the 2-on-1 or whizzer, spin off the opponent’s pushing/punching arm, move behind him, suddenly reverse and go with his force to get the upper hand.