Bill/Pegasus chuckled while pressing a button
A screen showed up in front of the contestants saying
"A duel of a lifetime"
"Seto Kaiba, Ultimate Duelist, execution, executed"
Kaiba was seen walking forward not looking back with his nonchalant attitude
A shriek is heard
Behind Kaiba can be seen a Toon Version of Dark Magician
In the distance Bill is seen in a dual against the Pegasus clone of himself
Pegasus clone is fighting for Kaiba's death while Bill is fighting for Kaiba's life
Pegasus had summoned Toon Dark Magician in attack mode while Bill had a Summoned Skull. Pegasus had a smirk and summoned a Toon Red Eyes Black Dragon monster.
In the maze, Kaiba is seen running while being chased by a Toon Dark Magician, as he takes a corner a wave of fire misses him barely as he ducked Toon red eyes attack.
Cue to the battle, Pegasus has summoned two other toon monsters, Dark Magician Girl, and Toon Black Luster Soldier. He chuckled summoning another monster.
Kaiba can see a light of the exit, almost reaches it.
Then he sees....
A Toon Blue eyes White Dragon....
He stood there...
Staring at the monster...
And ran past it as fast as he could. He reached the end of the maze.
Bill: well, you won-
But then he froze.
Bill looked up at Pegasus puzzled
Pegasus revealed his hand showing he has all five pieces of Exodia.

(Not my art)

Kaiba froze at that....
A huge bulking figure was forming with golden skin and chains all over
Kaiba: the forbidden one...
Kaiba in all his might ran as fast as he could at the mighty God known as Exodia
He was about to leap up and strike at the god,
Until he saw his brother on top of Exodia
Kaiba: Mo... kuba?
Mokuba: sorry Seto
Exodia in one blast, just evaporized Kaiba in a blast lighting the entire area leaving no shadow
...... in a few seconds everything was normal, back in the mystery Shack as if nothing happened... with one less member then they had before the trial