You're one of Shigaraki's Lieutenant, he was being upgraded when the heroes attacked the PLF base. You were carried by Gigantomachia the other league members were with you on his back as well, they got to shigaraki, and everything happened so fast... Shigaraki was different... he wasn't Shigaraki. Once the fight was over, he left you... Toga... and Mr. Compress... although, it made sense...Toga was nowhere to be seen...both you and Compress were in bad shape. He left you to die... so you ran...