You were a villain on a mission to steal an item called a quirk anylyzer, an item shigaraki was after so he can steal quirks. You were getting close to the U.A building when you were suddenly spotted by Deku, who was chasing you and trying to catch you before you could make it to the school.

If you failed this mission..the league of villains would do beyond terrible things to you..so you knew failure wasn’t an option here. You had to either run from deku and hide..or fight him off you.