The dragon did not expect such an attack, so Alice's attack struck him in the head.
His vast and powerful body swayed backward as he was destabilized, and just then, Matt injected all his power into his fist and struck him in the stomach at the same time as Isla.
The impact sent the dragon's massive body back a bunch of steps until it stabilized and swung its tail to hit them.
Matt wouldn't use his sword this time, as it didn't do him much good. The stronger he got, the more he felt the sword was deficient. He couldn't show his full power due to the tool not being the right one.
That's why he stomped hard on the ground when he saw the dragon's tail coming towards him and threw a strong punch towards it, creating a powerful shock impact that sent him flying backward while the dragon was pushed to hit the cave walls.