Kapitel 39: The trial ( 2 )

Why they are trying hard to prove it Muder?

According to post-mortem reports the victim died due to damage to the medulla oblongata. Here accused had smacked the glass near the medulla oblongata when he had turned back, that's why he didn't die in the moment. Why are they trying to prove that a murderer like the world will stop if they don't prove it murderer? 

"Prosecution, you may call a third witness." Judge said, "Yes, Your Honor. I call to stand the Mr. Iyer." The prosecutor said Mr. Iyer was one of the professors who teaches pediatrics to Yash. The Bailiff had made him oath after he stood on the accused stand. "Prosecution may examine the witness." Judge said, "Had you taught the topics about the important points and joints related to the brain? The prosecutor asked him, "Yup, two months back. I had completed entire topics related to the brain." He answered the second ingredient of the murder had been proved by this.