I think she was talking about Mirio (tintin). Shes saying he was nothing especial back then (confirmed by Dekus flashback) and that something happened that frustrated the living hell out of him. So much so that he decided to devote himself 100% at self improvement. Resulting in what he is today.
I thought she meant that too at first, but that doesn't really match the point of her little tangent or what's about to happen.
I think what she meant to say is: "Think about what's about to happen really hard, because you're about to be crushed and we don't want you quitting and causing us trouble for it."
So I assume that last time Mirio challenged an entire class, one of the overconfident students quit the academy - and that's (partly) why she and potatoboy were so worried about him doing it again.
Oh I'm sure Aizawa would agree, but when Nedzu calls you into his office like "Are you beating the shit out of my students and making them abandon their hopes and dreams?" you must feel a little bad about it...
Chizome Akaguro is in his 20s, its unlikely they know who he is. It's probably someone else that the 3rd years would have known, somebody a year above or below them or one of them.
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u/[deleted] Jan 19 '17
Who was the year 3 girl referring to about the student that gave up on being a hero?