5-Isha's mistake

Pottu was now at the entrance of the tree tunnel.He was now thinking of the phone call he received a few days back from the detective.

"Listen carefully " He said as Pottu pressed the phone to his ear.
" This Sasha bought an unlicensed revolver exactly 10 days ago and has been trying ever since to secretly gun down the person she has lately started to hate the most"
"And who is that? " asked Pottu as he felt hair rising on the back of his neck
"Prashi, you friend". The detective muttered.
" What? How do you know him?" Potti was confused.

" Remember the book you told me Sasha was reading.ahem I actually broke into her house a few days back.After scanning through her room, I collected a decent pile of books.And 2 of them were not actually books.They were diaries.A new one and an old one.The new one was Sasha's own diary and the other was to my surprise, Isha's.Are you listening?" the detective shouted
" Yes Yes..." Pottu felt his voice shake.

" After Isha's death,It didnt take long for Sasha to discover her sister's diary.Isha's diary was the storehouse of her emotions.It contained everything connecting her to this world.Had Isha been alive,Sasha could never have understood the thoughts that ran in Isha's mind.The very fact that Isha is dead is what prompted Sasha to believe and understand everything her sister wrote." the detective took a deep breath.
"And how can you say this?" Pottu demanded.

"Thats where Sasha's diary comes into picture.You see, she developed this habit after going through her sister's thoughts.Her diary is somewhat similar to Isha's but different in nature.She wrote how she never cared to understand Isha and hated herself for doing that.Through the diary, she could get a clear image of what her sister was.Isha was like you said,a very down to earth girl.But did you know that she visited a Psychiatrist every week"
"What?" asked a surprised Pottu.
" yeah, she had these suicidal tendencies when she was under acute depression.When she was 17, she attempted to cut her veins just because she came 2nd in some damn exam.The doctor said it was normal for human beings to make mistakes, repent, correct or forget them.But Isha couldn't, she just couldnt.Even a small mistake would haunt her for weeks.So It was natural that she did things slowly and carefully."
Now Pottu remembered how Isha nervously handled the teapot and other cutlery every time she came to his house.
"All she did was a simple mistake" the detective stopped.

Pottu didn't speak.
" She fell in love with your lazy friend, Prashi" the detective said.
Pottu closed his eyes, slapped his forehead and sighed "Of all guys"