Where did Locke get the grenade from, anyway? I thought the scene was horrible! Although I don't like Miles very much, I was like: Don't leave him there like this!!!! OMG! But it's possible that the grenade isn't real. Reminds me of a scene in some James Bod movie: He ties a guy up, puts a box in his hand and tells him that was a bomb that would explode because of the slightest movement and later it turns out to be a cigarette box^^

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- Does anyone know how to use a gun?
- I think you just pull the trigger.

- Hey kid, what's eating you?
- Nothing, he's at the top of the food chain!
(The Lion King^^)