this is after the training between class 1-A and 1-B when bakugo(who knows about izukus quirk) and all might are trying to get izuku to activate his new power,black whip. after he accidentally activated it during the training and almost hurt himself and uraraka and shinso when he also had a vision of the user who had black whip before who told him that it's more powerful now also a past user of one for all