

In episode 9 and episode 10 of _Re:Zero_ , when Rem uses

> her horn to engage beasts, it seems that she cannot control herself.

In episode 10, she also

> attacks Subaru and Ram. Subaru has to hit her horn to bring her out of the
> madness.  
>  
>
> [![Ep10](https://i.stack.imgur.com/g8b1kl.jpg)](https://i.stack.imgur.com/g8b1kl.jpg)  
>  Episode 10 at 19:47

However, in episode 11 on the flashback when Ram and Rem were young,

> none of them become crazy when they use their horns.  
>  
>
> [![Ram126](https://i.stack.imgur.com/NopMVl.jpg)](https://i.stack.imgur.com/NopMVl.jpg)  
>  Episode 11 at 1:26  
>  
>
> [![Rem217](https://i.stack.imgur.com/UBIEil.jpg)](https://i.stack.imgur.com/UBIEil.jpg)  
>  Episode 11 at 2:17

Could anyone explain it to me?

> Is madness the side-effect of using the horn, or are there any other causes?
> Because as I see, it happened to Rem in the forest with mabeast (demon
> beast) only.


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2016-09-08T17:34:37.487
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question
re-zero
Why did Rem go crazy when she used her horn at the forest, but not when she was young?


In that fight, she was overwhelmed and, in fact, was probably going to die
because she was too weak to kill all the wolves. She was also hysterical
because she had to kill the king wolf who cast a curse on Subaru, and if left
to run, its course would have killed him a few hours later.

So under normal use, she would not have her personality affected, but in this
case, she was in a hysterical rage to save Subaru and exhausted almost all of
her power on the minions before the boss she needed to kill showed itself.
However, why her personality changes when she loses control is not explained,
and I can only assume it to be a combination of her already unstable mental
state, her being drained of power due to the fighting, and possibly a side
effect of her Oni transformation that is normally manageable.

The details are taken from the arc 2 synopses of [Subaru's Wiki
page](http://rezero.wikia.com/wiki/Natsuki_Subaru/Synopsis)


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answer