that-insomniac-next-door's feed

One thing that I just don't get is why the author decided to have her both
unable to understand the language and unable to speak at all AT THE SAME TIME.

Seriously even if she could speak she still can't communicate that well with him because she doesn't know the language...so why make her mute on top of that? I swear the author better have some good excuse for this. Also, I understand she has been through hell, she is scared and therefore acting irrational BUT if 93% of communication is non verbal, out of which 55% is body language- I am in disbelief in the lack of communication between them. WHAT THE HELL HAPPENED TO THE GOOD OLD GAME OF CHARADES, HUH?