You were watching the fight of Izuku and Shigaraki. When all of a sudden Bakugo protects Izuku and gets impaled by Shigaraki Izuku: Kacchan!! Before Bakugo could fall Todoroki catches him luckily.

Bakugo coughs up a lot of blood as Shigaraki pulls the rivet stab out of Bakugo. Bakugo groans and starts losing blood.