That's easy. First, you need to frankly admit your mistake to make the other person cool down from his anger. Afterwards analyze the reasons you made the mistake, and give an account of your difficulties. Then earnestly request the other person to understand and forgive your error.

Uh-huh. You can write it like this: Through profound self-examination as well as educational help from the school's leaders, I have sensed the seriousness of my mistake. Regarding this I express my most sincere apology to the school and to the teachers. Also I want to convey my heartfelt thanks to the teachers and fellow students that criticized me, reminded me and cared for me in this incident. As a full time student, I deeply love my school grounds, and through this unintentional mistake I have realized that I need to increase my awareness of safety at all times and improve my technique when playing ball. At the same time, I have felt that I should pay more attention to the effect of my words and actions on the school. I will use this lesson as a starting point to strive to become a good student who is developing in an all-round way: morally, intellectually and physically. Lastly, I again express my apologies.

Friar Sand fell to his knees and implored Tang Seng, "Master, I beg you not to read the incantation."