Is Your Class 1a A Hidden Danger? Find Out Now!
The scene in question is when aoyama is about to blast izuku with his naval laser; We see the effect for danger sense activate. And like he said in his battle against class 1a; It only reacts when theres malicious intent. Izuku told his classmates that his presence was a danger to them as all for one could kill them, so he had to leave.
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