Rember what Bea Klugh said Has Walt appeared in a place he wasn't supposed to be? This means maybe walt can appear in two places at the same time. Maybe walts at thsi temple, or at home.. But i think that thats is him not jacob.. But i think that jacob told walt to help him..

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Hurley: What about the B-O-D-Y-S?
Michael: What are spelling, man? Bodies?
Walt: B-O-D-I-E-S.

Hurley: Dude, you've got some Artz on you.

Bernard: I'm a dentist, not Rambo.
Rose: And don't forget that!