Board Thread:Mortal Kombat Wiki/@comment-11288626-20150724133835

Okay, so the armageddon happened, Raiden used his cracked/broken amulet to send a message to his past (He Must Win). But, after Kung Lao, Jade and almost all earthrealm defenders died, couldn't he send a message to his past again (This time, saying something like  Shao Kahn Must Win) and save everyone? Is it necessary for the amulet to be cracked like that?

I don't remember if its explained, just some sort of question left in my mind after finishing MK 2011. 