With a fireball formed of the Fire Powerhouse's compressed Fire Energy, Adam suddenly disappeared from where he stood, and appeared behind the Fire Powerhouse.
His movements were instantaneous thanks to the Step Skip Skill and there was no way to avoid the attack, if Adam attacked him with the fireball, but he wasn't looking to kill him. Instead, he kicked the side of his head with an explosive high kick, then followed it with another kick from his left leg that flung him up into the air.
Then using the Step Skip Skill, he used the same two kicks on both the Sword Powerhouse and the Speed Powerhouse, leaving them all dozens of metres in the air and barely conscious. With all of them in the air at once, Adam flung the explosive fireball he had in his hand at them, and timed it so that it hit them all at once.