As Sam started shooting at everyone while they are still making their way to him, he suddenly felt a sense of crisis from behind. He titled his board making the thrusters below the board face backward and an air cannon was launched.
He used the recoil to move away from his spot and the large air cannon hit something.
Sam hovered a distance away looked at the thing that appeared out of thin air. It is a large throwing star. And it was invisible. If Sam was even a little bit lax, he would have been cut into two by that star. It was that large. Large enough to cut a person into two.
Apart from the star, there is also another person who appeared from the invisibility. He is a man in the black cloak.
He is part of the Black Ghost team that attacked them.
