Annabeth threw the rock at Jack's face like a dodge ball, and once it was a foot from his face it burst into flames, picking up speed and crashing into his face. Once it collided with his armor, the rock burst into pieces with the fragments disappearing while they fell. A similar sized rock appeared back in Annabeth's hand, making her snicker to herself.
This immediately was the the cue to attack to Drake and Max, with them opening their mouth towards the armored boy. A line of energy immediately burst out of both of their mouth's, but they weren't pointing directly at Jack. They went in an angle so the blasts hit, with the blasts circling each other until it formed into a fireball the size of a beach ball. The brothers bounced it between each other, as if preparing to launch it at him.
The process gave Dianna time to fly higher into the sky into the area where the clouds were thicker. She flew forwards a few yards then silently flew back down two or three feet behind Jack, waiting for him to attack one of them.