Explosion

As the blue ball of fire landed on Alex, it opened like a blossoming flower into a massive fireball that only grew larger to cause a great explosion.

Alex was sent flying away into the distance with terrible pain in his chest. When he landed on the ground, all he could do was writhe in pain. 

He placed his hand on his chest and all he felt was head and blood. This was a terrible wound. 

It didn't end there. His arm, face, and legs had been scorched as well. His hairs were singed all over his body. His clothes were still burning with the terrible blue flame, which he quickly tore off and threw to the side despite the pain.

When he stood up, all he could do was limp. Fortunately, he hadn't suffered anything permanent, but he had taken a lot of damage.

The wound, the pain, the fire, it all told him one thing that he couldn't believe at all.