How did Duke Zhou explain that he was injured in a fight?

When I dream of fighting and hurting my lips, I put my own affairs aside to take care of other people's lucky days. Help people who are inconvenient to run errands and listen to their voices for people in distress. Your little help has greatly appreciated the other party. However, my physical condition is not very good these two days, and my mental vitality shows signs of decline in the evening. I need to work overtime and stay up late, so I'm not allowed to help others. I'm still willing to do what I can.