Jacob was confused about this ambiguous reply, "I don't understand what you're hinting at."
The Dark Beings could be said to be on the other side from where the Dark City was, and he knew about their successful conquest of the Freedom Plains. So, Hallberg bringing them up clearly didn't make sense in Jacob's mind.
Furthermore, Hallberg seemed to be appeared somewhat scared, which was quite strange since Dark City shouldn't be afraid of Dark Beings because they have a huge geographical advantage and they normally aren't afraid of anyone.
Hallberg then explained, "What I want to say is the Dark Being's King, the Lich King, has pointed his sword toward the Magic Beast Forest after his conquest of the Freedom Plains.
"Not only that, but he deliberately called out that he would eradicate all the living beings on the Rare Plains, including the ones hiding in the Dark City, which is not normal at all.
