MIB back in Season 1

After recently just seen another great season premiere of LOST, we all now know that the MIB is the monster we have known from season 1. I was also just thinking back to season 1, and its season finale. I wonder why the monster was trying to pull John Locke into the Cerberus vent now knowing that it was MIB? Was he trying to kill him way back then? What do you guys think about this?

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