Jack looked at Rebecca's head and could see another one of her hearts turning red. His eyes then landed on her face and he could see a complicated expression. He could tell that she was somewhat dissatisfied with the things that had been happening to her. Jack himself might not have handled his situation this well.
"Stand up and get that gun," Jack said as he relaxed his posture and placed his gun down. Now he was not that afraid of Rebecca as he had already gotten two of her hearts, Jack knew that she would not harm him until something extreme happened. Two hearts were more than enough for Jack to assess her as safe.
Feba and Faneel on the other hand didn't know about Jack's love meter, so when they heard what Jack said their bodies strengthened up and they first looked at Jack with confused expressions and then maintained their focus on Rebecca, they were ready to shoot her if she did something suspicious.
"Jack, are you sure about this?"