Dylan's expression worsened.
In the Ash Tower's hall, Dylan had told Solomon that he should stay close to that youth to protect him properly. He meant to imply that if Solomon ever moved away from him, even just a bit, the Ash Tower's revenge would fall on him.
This was something Dylan had to do.
Harrison's injury wasn't just his own problem. It also related to the reputation of the Ash Tower, to Dylan's reputation. If he really let that youth leave Oddrock City unharmed, what would happen to the reputation of the Ash Tower? What would be the point of Dylan having so many subordinates?