It was the training camp attack by the LOV aka the league of villains and you were running around to help people you see with the authorization from Aizawa to use your quirk.

you keep going until you saw one of the villains, Toga about to stab an injured Midoriya from behind. Himiko : "I finally got you Izuku-Chan." she was about to stab him and Izuku couldn’t defend himself because of his injuries.