Graven was waiting for his brother in his headquarter, which is located in the forest, on the outskirt of South Pond Town.
He knew that Luke will find him here.
He stood in the clearing and rose in the air at lightning speed after he detected his brother's scent around the area. He was anticipating his anger and he doesn't want his crazed brother burning the whole place down.
He floated in the air and saw the ball of deadly flames coming his way, damn! That was his brother's first attack! He dodged the flames coming in his direction from all angles.
Right now, his brother is hiding in his invisible form, he can't see him!
He can only avoid his deadly attacks!
Sooner or later, when the heat consumed his brother's body and he can no longer bear it, he will eventually stop and be forced to cool down his body before launching another attack again.