Tina still has a lingering hatred for her parents. I can't say I can relate to her but if she still cannot forgive them even though they were controlled by the demons, then perhaps I am not going to say anything. I am surprised at her decision though of meeting them and accepting the invitation as that indicates that this will not be a wholesome reunion and yet she has chosen that option.
But it's her choice. I could choose to ignore her option and just not bother to join her to return but I am not that awful.
After that incident, Tina returned to the summons area, probably to train more. We have still a few days of in-game time before we will depart so until then, maybe she will change her mind.
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The day of our departure arrived.