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Bernard was a sore loser, he didn't wanted to admit his true defeat and called out to Vheslia's power as cheat, which allowed her to win even when he should had won, he thought deep down he won even when he didn't. He was a man with a turbulent past and he valued winning over things a lot more due to his lack of self-esteem. Due to this, he acted arrogant and couldn't accept such a defeat so easily.
"It's not exactly out of my ass if I had since I was a kid, idiot! Don't you know how many difficulties it brough to me when I was a kid? I had my mana drained all the time and I couldn't even be a competent magician…" sighed Vheslia.
"Hmph. Whatever." Bernard simply ignored her.
"I am going to rip apart your legs again!" she roared, but we stopped her before she were to go out of control.
"Relax for a bit, dear, no need to go that far for an idiot." Sighed Gwendolyn.
Check "The Protagnist's Sister Is Actually the Strongest"!