Question: what happened to zach in 13 reasons why season 1?
Answer: It was Bryce, Zach's friend turned mortal enemy, who broke Zach's knee during the brawl. An angry and devastated Zach followed him to the docks where he beat him to a bloody pulp. Later on, Alex (Miles Heizer) and Jessica (Alisha Boe) arrived to find a badly wounded Bryce.