Gabriel was hurt pretty badly from Locust's slash to his stomach, and in his stunned state he was knocked over by the monstrous being. Locust was about to bring his jaws down on Gabriel's head when Blast Girl intervened and forced the creature off of him. He was grateful for the assistance and he tried to get to his feet as quick as he could with the injuries he had sustained from the battle. He looked at the battle going on between Blast Girl and Locust and saw his chance to help when the heroine used a piece of her armor as a projectile weapon. 

Gabriel decided to use both his Purification and Damnation abilities at once. He charged up his Purification beam in his right hand and then his Damnation attack in his left hand. "Foul beast, taste the wrath of God!"

He fired both of his blasts and they shot towards Locust at blinding speeds. When they hit he would be hit by both his Purification and Damnation power which would be incredible powerful.