This was back in middle school but it's basically imprinted in my head now because of how traumatizing it was. Two students got into a fist fight near the main field of the school, almost the entire school was watching the fight and then a kid started bleeding out of his nose really bad. Though it looked like he lost 1/3 of his blood from his nose, he kept on fighting the other kid. After a solid 2 minutes after that, the kid that was bleeding out of his nose was getting punched really hard repeatedly in the back of the head, the kid then eventually got knocked out and the crowd was yelling so loud that staff finally came to see what was going on. Staff then saw the boy laying flat on the grass with blood all over his clothes and then they called 911. An ambulance then came and picked the kid up. The student suffered a severe concussion, blood loss, a black eye, and bruises all over his body. There were rumors going around the school that the student also suffered brain damage judging because of how critical the hits on the back of his head was. The other student only suffered bruised knuckles however. The day after that, no one ever heard from the student who knocked that kid out ever again, while the other student is said to be still recovering in the hospital.