Alfred has already left but Elaina couldn't help but stop and think about the information that Alfred brought along. If she have heard this information from Alfred a little earlier, perhaps she wouldn't think much about it and think that Alfred might be thinking too much. But after seeing the future that his children will become, it is no longer a laughing matter.
The Prophecy of having twins kill the fallen god. Considering that her sister have escaped with the man himself, there is no doubt about it that they are still alive and are ready to strike back when the time is ripe. Considering that they are in a hiding, there is no news that would allow them to monitor what they are doing. Not only that but considering that one is a fallen god, he might have lost the war but that doesn't mean he cannot collect more forces to strike back.
