Being suddenly kneed in the stomach woke Johnathan out of his world. Jack released his hands and Johnathan hurriedly retreated. Now, he began focusing on the fight. Previously, he had simply been attacking, forgetting that this was a fight where he could be hit.
Jack's lack of offense had made him completely submerge in the state where he only thought of attacking.
Now that he could focus, he noticed that of all the punches that he had thrown, none of them had actually managed to land on Jack. Not feeling convinced, Johnathan attacked. This time, he made sure that he was ready to defend any strike that came from Jack.
He threw a kick this time. Since punches didn't work, he decided to try kicking. Perhaps he would actually be able to land a hit on him.
But against his expectations, Jack didn't stand there. He took a few steps backwards and evaded the kick.