Before they had left Peter's room, both Fex and Logan had updated Peter on the whole situation. They informed him of the plan and troubles that came with it.
Without hesitation, after being told what needed to be done, Peter had agreed. After hearing this was all for Quinn's sake, he was happy he would actually be of some help to his creator and saviour.
However, the sudden response seemed strange, Fex thought. Sure, Wights were loyal to their creators, but not like this. One would have to command an order and be forced to do so due to the bond of blood, but Peter seemed to have been so accepting over the whole thing.
"I can't guarantee what will happen to you when they find out," Fex said. "You could be killed." The words spoken were trying to deter him.
"It's okay," Peter replied. "Better than being left in the hands of the humans. Besides, if I stayed, there is a good chance they would find out about all of you, and I wouldn't want anything to happen."
