He's lying. Jacob isn't telling us what to do. Because Jacob never tells us what to do. I'm going to make this simple. If that thing leaves the island, that's it. I-it's over.
Because he was stupid enough to believe he had been brought here for a reason. Because he pursued that belief until it got him killed. And because you were kind enough to bring his body back here in a nice little wooden box.
Leave! But because Jacob chose you you were trapped on this Island, before you even got here. Now Jacob's dead, we don't need to be trapped here. We can get on a plane and fly away anytime we want.
[A few seconds later, a mortar round lands behind The Man in Black, causing an explosion. He doesn't even twitch, unimtimidated. Zoe gives him a walkie]
ZZoe
You can call us on that when you're ready to return what you took.
[Zoe leaves. The Man in Black drops the walkie and crushes it with his stick]
We were brought here because we were supposed to do something, James. And if Locke-- if that thing wants us to leave, maybe it's because he's afraid of what happens if we stay.
Because I could kill you, Jack. Right here, right now. And I could kill every single one of your friends, and there is not a thing you could do to stop me. But instead of killing you, I saved your life, and now I want to save them too.
This is what he wanted. This has been what he has been waiting for. Everything that he has done has been to get us here. He wanted to get us all at the same place at the same time in a nice enclosed space where we had no hopes of getting out.
Locke said that he couldn't leave the Island without us. I think that he can't leave the Island unless we're all dead. He told me that he could kill any one of us whenever he wanted, so what if he hasn't because he's not allowed to? What if he's trying to get us to kill each other?
Listen carefully. There's a well on the main Island a half mile south from where we were just left. Desmond is inside it. Locke wants him dead, which means you are going to need him. Do you understand me?