As Gustav's fist passed by the side of his head, he was ready to voice out another sound attack when he felt a force headed for his gut.
Bang!
Gustav's knee slammed heavily into Zergeref's gut, causing him to spit out saliva as he was sent hurling across the air.
Bang!
He slammed into the building on the other side, causing a sound wave to get sent across the place.
Gustav got blasted backward once more due to the overamplification of sound in the vicinity.
He stabilized himself after sliding back for some feet and prepared to attack again when Zergeref screamed out from his current location.
Boom!
A massive wave spread across the vicinity, sending Gustav flying again.
The problem about the soundwaves as they covered a wide range, and now another building has collapsed from this.
It was practically impossible for Gustav to dodge them.