Locke returns to camp to find everyone unconscious

Locke returns to his camp to find everyone unconscious. He looks panicked as he walks through the bodies strewn about. He finds Sayid, wakes him up and asked what happened. Sayid said they were attacked and he does not know by who. Locke is really panicked now and asks where Jin is.

I think this is the first time we've really seen smoke monster Locke appear scared. With Jin missing, is his grand plan unraveling?