Ali: She use the weapon that she not fully understand, now she paid the price to use it. Never use any weapons that we know how to use or understand it. Information is critical, and we need information. What happens if she kill her sister or even teleport to another dimension and won't come back. Celestia will be broken and Everything will be different. Good thing it haven't happen, but what if history change and didn't have records of it. Mmmmm...