Plot hole: Bonnie is the anchor for the other side and feels when supernatural beings die. How come she didn't know Katherine wasn't dead? Did she never think it was suspicious that she never felt Katherine's body after she died?
The Vampire Diaries (2009)
Episode list - season 2
Starring: Ian Somerhalder, Nina Dobrev, Kat Graham, Candice Accola, Candice King, Paul Wesley
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Suggested correction: Katherine died but didn't go to the other side. So she didn't need to go through Bonnie. She went to hell to Arcadius. Bonnie is not the anchor to hell, we don't know how going to hell works.
After everyone finally realises that Elena had been possessed by her Doppelgänger Predecessor, It is actually shown that Katherine were more or less dragged away from Bonnie before she could crossover to the Otherside. So we do have some idea as to how one ends up in Hell.
Suggested correction: Katherine was a human technically when she died.
Technically, she was supernatural because she was a doppelganger, so she should've gone through Bonnie.
And even she was a traveller.
Damon Salvatore: I DO believe in killing the messenger. Why? Because it sends a message.
Question: If Katherine/Silas are the ones who killed the hunter, that is Jeremy, why aren't they are cursed with the hunter's curse?
Answer: Silas did mention to Bonnie later that he was so powerful he was able to overcome Jeremy's hunter's curse in minutes.