(Remember this is during early Zexal, so Yuma isn't that good at Dueling yet, so he'll make a lot of mistakes).
Caswell Turn 1: Caswell sets a monster.
Yuma Turn 2: Yuma Normal Summons Flelf (800/1300) in Attack mode. Flelf attacks Caswell's set monster, but it's revealed to be Crashbug X (0/2000), causing the attack to fail (Yuma LP: 4000 -> 2800). Yuma sets a card.
Caswell Turn 3: Caswell Normal Summons Crashbug Z (0/1500) in Attack mode. Since Caswell Normal Summoned Crashbug Z while he controlled Crashbug X, he Special Summon Crashbug Y (1400/1600) in Attack mode, from his Deck, via Crashbug Z's effect. Caswell then activates Mystical Space Typhoon Yuma's face down card(Half Unbreak). Crashbug Y attacks and destroys Flelf (Yuma LP: 2800 -> 2200). Caswell sets a card.
Yuma Turn 4: Yuma Normal Summons Gogogo Golem (1800/1500) in Attack mode. Gogogo Golem attacks Crashbug Z, but Caswell activates his face down Crush Card Virus to Tribute Crashbug Z and destroy Gogogo Golem since its attack was higher than 1500. Also, any monster in Yuma's hand and any monster that Yuma draws during the next 3 turns will be destroyed if it has 1500 or more attack. Due to the Lingering effect of Crush Card Virus, Yuma must also play with his hand revealed to Caswell for the next 3 turns. Yuma's hand currently contains Gagaga Magician, Gentlemander, Stinging Swordsman, and Double or Nothing. Gagaga Magician is sent to the GY, due to Crush Card Virus, because it's attack is 1500.
Caswell Turn 5: Caswell Normal Summons Crashbug (100/100) in Attack mode. Crashbug and Crashbug Y attack Yuma directly (Yuma LP: 2200 -> 700). Caswell sets a card.
Yuma Turn 6: Yuma draws Ego Boost and reveals it due to Crush Card Virus' Lingering effect. He then Normal Summons Gentlemander (1200/1000) in Attack mode. Gentlemander attacks Crashbug. Yuma then activates Ego Boost (as he declared an attack) to increase the attack of Gentlemander by 1000 and make the attack of Crashbug become its original value, until the end of the Battle Phase (1200 -> 2200). However, Caswell activates his face down Negate Attack to negate the attack and end the Battle Phase.
Caswell Turn 7: Caswell switches Crashbug X into Attack mode. He then activates Shield & Sword to switch the attack and defense of every monster on the field, until the end of the turn (Gentlemander: 1200/1000 -> 1000/1200, Crashbug X: 0/2000 -> 2000/0, Crashbug Y: 1400/1600 -> 1600/1400, Crashbug: 100/100 -> 100/100). Crashbug Y attacks and destroys Gentlemander (Yuma LP: 700 -> 100). Crashbug X attacks directly (Yuma LP: 100 -> 0). Caswell wins.
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Yugioh Off-Screen Duels
De TodoThese are my ideas about what happened in the Duels in any of the Yugioh Series that we didn't get to see. For example, Aster(Edo) v.s. Yusho in Arc V. Or Yuma's friends Dueling the 7 Barian Emperors in episode 124 to 125 of Zexal. This is just for...