You were about to train in the USJ until Kurogiri’s warp gate opens up in the central plaza in the USJ and a lot of villains come out including Shigaraki and Kurogiri. The gate closes

Shigaraki: ”Since All Might isn’t I here then all of us should fight the class and teachers!” Shigaraki start smiling

Kurogiri steps forwards and starts walking towards class 1-A while Aizawa is fighting all the villains