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Nighteye was about to die and they had a girl who can rewind someone to their
former state, make them younger or repair their injuries.

Why didn’t the heroes try to use Eri to rewind Nighteye to prevent him from
dying?


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2020-01-18T18:56:27.670
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question
my-hero-academia
Why didn’t the heroes try to use Eri to rewind Nighteye to prevent him from dying?


I believe this is because they put her in quarantine. With the reason being
that she can’t control her power, which could result in restoring him to
nothing.


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2020-01-18T19:09:29.507
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answer


As Eraserhead says when he's escorting Deku to Nighteye's room, Eri's Quirk is
not under control and is likely to destroy someone rather than heal them,
which is why he says "We cannot depend on her Quirk" - specifically, they
can't make use of it to save Nighteye.


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2020-01-19T23:17:11.207
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There are multiple reasons behind this:

  1. **Quirk**. As @Kerkhof & @ConMan said, she can't control her powers and could do more harm then good. We still don't know the extent of her quirk so she could turn in into a baby in 3 seconds if she loses control maybe.

> [![enter image description
> here](https://i.stack.imgur.com/upAgc.jpg)](https://i.stack.imgur.com/upAgc.jpg)

  2. **Eri's state**. After the fight with Chisaki, she is seen in a deep sleep/"coma" like state and they could do nothing to wake her up so she could'nt help even if she wanted to.

> [![enter image description
> here](https://i.stack.imgur.com/wm8Xc.jpg)](https://i.stack.imgur.com/wm8Xc.jpg)

  3. **Time**. We see in chapter 161 that Night-Eye dies moments after they are all rushed to the nearest hospital so even if Eri was conscious and healthy and even if they were able to find a way to use Eri's powers to help Night-Eye, it would've been a race against time and there were no assurances that they could do it.

  4. **Trauma** : Everyone in knew how much Eri suffered. And how she blamed herself for everything. Seeing this people decided not to tell Eri about Night-Eye's Death. Because she is too small to understand/process all this. She might have even started hating herself or go berserk.(context: Anime)


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2020-02-12T12:20:43.513
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